From 79e6c1dfe2487e041f939a2b829b3957ccc23447 Mon Sep 17 00:00:00 2001
From: Matthias Maier <tamiko@43-1.org>
Date: Thu, 6 Jul 2023 22:57:58 -0500
Subject: [PATCH] documentation: use https:// instead of http://

---
 doc/developers/cmake-internals.html       | 10 ++++-----
 doc/developers/packaging.html             | 10 ++++-----
 doc/developers/porting.html               | 26 +++++++++++------------
 doc/developers/testsuite.html             |  8 +++----
 doc/developers/writing-documentation.html | 18 ++++++++--------
 doc/external-libs/arpack.html             | 16 +++++++-------
 doc/external-libs/cuda.html               |  2 +-
 doc/external-libs/ginkgo.html             | 10 ++++-----
 doc/external-libs/gsl.html                | 14 ++++++------
 doc/external-libs/lapack.html             | 10 ++++-----
 doc/external-libs/opencascade.html        | 12 +++++------
 doc/external-libs/p4est-setup.sh          |  2 +-
 doc/external-libs/p4est.html              | 14 ++++++------
 doc/external-libs/petsc.html              | 14 ++++++------
 doc/external-libs/slepc.html              | 10 ++++-----
 doc/external-libs/trilinos.html           | 18 ++++++++--------
 16 files changed, 97 insertions(+), 97 deletions(-)
diff --git a/doc/developers/cmake-internals.html b/doc/developers/cmake-internals.html
index 89c603f561..d2a69fe745 100644
--- a/doc/developers/cmake-internals.html
+++ b/doc/developers/cmake-internals.html
@@ -1,5 +1,5 @@
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
-	  "http://www.w3.org/TR/html4/loose.dtd">
+	  "https://www.w3.org/TR/html4/loose.dtd">
 <html>
   <head>
     <title>Build system internals</title>
@@ -746,10 +746,10 @@ expand_instantiations(obj_dofs "${_inst}")
 
 <hr />
 <div class="right">
-  <a href="http://validator.w3.org/check?uri=referer" target="_top">
-    <img style="border:0" src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
-  <a href="http://jigsaw.w3.org/css-validator/check/referer" target="_top">
-    <img style="border:0;width:88px;height:31px" src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
+  <a href="https://validator.w3.org/check?uri=referer" target="_top">
+    <img style="border:0" src="https://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
+  <a href="https://jigsaw.w3.org/css-validator/check/referer" target="_top">
+    <img style="border:0;width:88px;height:31px" src="https://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
 </div>
 
 </body>
diff --git a/doc/developers/packaging.html b/doc/developers/packaging.html
index 1b5413bb3a..0319b365e4 100644
--- a/doc/developers/packaging.html
+++ b/doc/developers/packaging.html
@@ -1,5 +1,5 @@
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
-	  "http://www.w3.org/TR/html4/loose.dtd">
+	  "https://www.w3.org/TR/html4/loose.dtd">
 <html>
   <head>
     <title>Packaging deal.II</title>
@@ -99,9 +99,9 @@
 
 <hr />
 <div class="right">
-  <a href="http://validator.w3.org/check?uri=referer" target="_top">
-    <img style="border:0" src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
-  <a href="http://jigsaw.w3.org/css-validator/check/referer" target="_top">
-    <img style="border:0;width:88px;height:31px" src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
+  <a href="https://validator.w3.org/check?uri=referer" target="_top">
+    <img style="border:0" src="https://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
+  <a href="https://jigsaw.w3.org/css-validator/check/referer" target="_top">
+    <img style="border:0;width:88px;height:31px" src="https://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
   </body>
 </html>
diff --git a/doc/developers/porting.html b/doc/developers/porting.html
index 926208f9a1..412e176178 100644
--- a/doc/developers/porting.html
+++ b/doc/developers/porting.html
@@ -1,5 +1,5 @@
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
-	  "http://www.w3.org/TR/html4/loose.dtd">
+	  "https://www.w3.org/TR/html4/loose.dtd">
 <html>
   <head>
     <title>Porting deal.II</title>
@@ -15,7 +15,7 @@
 
     <p>
       <acronym>deal.II</acronym> uses very few
-      <a href="http://www.opengroup.org/austin/">POSIX</a> specific system
+      <a href="https://www.opengroup.org/austin/">POSIX</a> specific system
       features and is otherwise fairly ISO (2011) C++ Standard compliant.
 
       Consequently, there is a good chance that <acronym>deal.II</acronym>
@@ -29,9 +29,9 @@
     <p>
       Currently, the <acronym>deal.II</acronym> CMake build system
       recognizes
-      <a href="http://gcc.gnu.org/">gcc</a>,
-      <a href="http://clang.llvm.org/">clang</a>, as well as
-      <a href="http://software.intel.com/en-us/intel-compilers">icc</a>, and
+      <a href="https://gcc.gnu.org/">gcc</a>,
+      <a href="https://clang.llvm.org/">clang</a>, as well as
+      <a href="https://software.intel.com/en-us/intel-compilers">icc</a>, and
       sets up reasonable default compiler flags.
       <ul>
         <li>
@@ -54,7 +54,7 @@ cmake/setup_compiler_flags.cmake
 cmake/setup_compiler_flags_gnu.cmake
 cmake/setup_compiler_flags_icc.cmake
 </pre>
-          Patches are highly welcome! See <a href="http://www.dealii.org/participate.html">here</a>
+          Patches are highly welcome! See <a href="https://www.dealii.org/participate.html">here</a>
           for information on how to get in contact with us.
         <li>
           You might want to have a look at
@@ -72,26 +72,26 @@ include/deal.II/base/config.h.in
 
     <p>
       <acronym>deal.II</acronym> should support almost all reasonably
-      <a href="http://www.opengroup.org/austin/">POSIX</a> compliant
+      <a href="https://www.opengroup.org/austin/">POSIX</a> compliant
       platforms out of the box. Nevertheless, the following bits of
       information might help:
       <ul>
         <li>
           The build system of <acronym>deal.II</acronym> uses <a
-          href="http://www.cmake.org/" target="_top">CMake</a>.  So,
+          href="https://www.cmake.org/" target="_top">CMake</a>.  So,
           in order to port <acronym>deal.II</acronym> to a new platform,
-          it is obviously necessary that <a href="http://www.cmake.org/"
+          it is obviously necessary that <a href="https://www.cmake.org/"
           target="_top">CMake</a> supports the platform in question
           with at least one generator for a native build tool, see <a
-          href="http://www.cmake.org/cmake/help/documentation.html">here</a>.
+          href="https://www.cmake.org/cmake/help/documentation.html">here</a>.
         <li>
           <acronym>deal.II</acronym> is mainly developed with <a
-          href="http://gcc.gnu.org/">gcc</a> on GNU/Linux, so it is
+          href="https://gcc.gnu.org/">gcc</a> on GNU/Linux, so it is
           best to begin porting to a new platform with the help of <a
-          href="http://gcc.gnu.org/">gcc</a>.
+          href="https://gcc.gnu.org/">gcc</a>.
           After that a platform specific compiler might be tried.
         <li>
-          Almost all <a href="http://www.opengroup.org/austin/">POSIX</a>
+          Almost all <a href="https://www.opengroup.org/austin/">POSIX</a>
           specific code is well guarded with fall-back code in case the
           specific POSIX function is not available. There is (currently)
           one exception, though: Routines that measure elapsed CPU time in
diff --git a/doc/developers/testsuite.html b/doc/developers/testsuite.html
index 0d73f6479e..5f43cb2cd1 100644
--- a/doc/developers/testsuite.html
+++ b/doc/developers/testsuite.html
@@ -965,10 +965,10 @@ $ ctest -DCONFIG_FILE="[...]/config.sample" [...]
 
     <hr />
     <div class="right">
-      <a href="http://validator.w3.org/check?uri=referer" target="_top">
-        <img style="border:0" src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
-      <a href="http://jigsaw.w3.org/css-validator/check/referer" target="_top">
-        <img style="border:0;width:88px;height:31px" src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
+      <a href="https://validator.w3.org/check?uri=referer" target="_top">
+        <img style="border:0" src="https://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
+      <a href="https://jigsaw.w3.org/css-validator/check/referer" target="_top">
+        <img style="border:0;width:88px;height:31px" src="https://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
     </div>
 
   </body>
diff --git a/doc/developers/writing-documentation.html b/doc/developers/writing-documentation.html
index b310bb8832..41a580ef12 100644
--- a/doc/developers/writing-documentation.html
+++ b/doc/developers/writing-documentation.html
@@ -1,5 +1,5 @@
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
-                 "http://www.w3.org/TR/html4/loose.dtd">
+                 "https://www.w3.org/TR/html4/loose.dtd">
 <html>
 <head>
   <meta http-equiv="Content-type" content="text/html;charset=UTF-8">
@@ -57,10 +57,10 @@
     <p>
     In order to extract documentation from the header files of the
     project, we use
-    <a href="http://www.doxygen.org/" target="_top">doxygen</a>.
+    <a href="https://www.doxygen.org/" target="_top">doxygen</a>.
     It requires that documentation is written in a form which
     closely follows the
-    <a href="http://java.sun.com/products/jdk/javadoc/index.html" target="_top">
+    <a href="https://java.sun.com/products/jdk/javadoc/index.html" target="_top">
     JavaDoc</a> standard.
     </p>
 
@@ -108,7 +108,7 @@ class TestClass
     In order to allow better structured output for long comments,
     doxygen supports a great number of tags for enumerations,
     sectioning, markup, and other fields. We encourage you to take a
-    look at the <a href="http://www.doxygen.org/"
+    look at the <a href="https://www.doxygen.org/"
     target="_top">doxygen webpage</a> to get an overview. However,
     here is a brief summary of the most often used features:
     </p>
@@ -183,7 +183,7 @@ void foobar ()
          <tt>function_name()</tt> to reference member functions and
          <tt>#variable_name</tt> for member variables to create links
          automatically. Refer to the documentation of <a
-         href="http:www.doxygen.org"><acronym>doxygen</acronym></a> to
+         href="https://www.doxygen.org"><acronym>doxygen</acronym></a> to
          get even more options for global variables.
          </p>
 
@@ -451,10 +451,10 @@ void foobar ()
 
     <hr />
     <div class="right">
-      <a href="http://validator.w3.org/check?uri=referer" target="_top">
-        <img style="border:0" src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
-      <a href="http://jigsaw.w3.org/css-validator/check/referer" target="_top">
-        <img style="border:0;width:88px;height:31px" src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
+      <a href="https://validator.w3.org/check?uri=referer" target="_top">
+        <img style="border:0" src="https://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
+      <a href="https://jigsaw.w3.org/css-validator/check/referer" target="_top">
+        <img style="border:0;width:88px;height:31px" src="https://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
     </div>
 
   </body>
diff --git a/doc/external-libs/arpack.html b/doc/external-libs/arpack.html
index 731dba8d79..c44d244cb8 100644
--- a/doc/external-libs/arpack.html
+++ b/doc/external-libs/arpack.html
@@ -1,5 +1,5 @@
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
-	  "http://www.w3.org/TR/html4/loose.dtd">
+	  "https://www.w3.org/TR/html4/loose.dtd">
 
 <html>
   <head>
@@ -14,10 +14,10 @@
     <h2>Installation of <acronym>ARPACK</acronym></h2>
 
     <p>
-      <a href="http://www.caam.rice.edu/software/ARPACK/">ARPACK</a>
+      <a href="https://www.caam.rice.edu/software/ARPACK/">ARPACK</a>
       is a collection of Fortran77 subroutines designed to solve large
       scale eigenvalue problems.
-      <a href="http://www.caam.rice.edu/software/ARPACK/" target="_top">ARPACK</a>
+      <a href="https://www.caam.rice.edu/software/ARPACK/" target="_top">ARPACK</a>
       should be readily packaged by most Linux distributions.
       Don't forget to install a development version of the library.
     </p>
@@ -43,7 +43,7 @@
       and the patch, unzip the files you got. That will create
       a directory named <acronym>ARPACK</acronym>. If you need
       further instructions please read the README file or the
-      <a href="http://www.caam.rice.edu/software/ARPACK/SRC/instruction.arpack">instructions</a>.
+      <a href="https://www.caam.rice.edu/software/ARPACK/SRC/instruction.arpack">instructions</a>.
       We will explain here in a few steps what has to be done to be able
       to compile <acronym>ARPACK</acronym>.
     </p>
@@ -145,10 +145,10 @@
 
     <hr />
     <div class="right">
-      <a href="http://validator.w3.org/check?uri=referer" target="_top">
-        <img style="border:0" src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
-      <a href="http://jigsaw.w3.org/css-validator/check/referer" target="_top">
-        <img style="border:0;width:88px;height:31px" src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
+      <a href="https://validator.w3.org/check?uri=referer" target="_top">
+        <img style="border:0" src="https://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
+      <a href="https://jigsaw.w3.org/css-validator/check/referer" target="_top">
+        <img style="border:0;width:88px;height:31px" src="https://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
     </div>
 
   </body>
diff --git a/doc/external-libs/cuda.html b/doc/external-libs/cuda.html
index c7e995a0c7..6e6be86b17 100644
--- a/doc/external-libs/cuda.html
+++ b/doc/external-libs/cuda.html
@@ -1,5 +1,5 @@
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
-	  "http://www.w3.org/TR/html4/loose.dtd">
+	  "https://www.w3.org/TR/html4/loose.dtd">
 <html>
   <head>
     <title>The deal.II Readme on interfacing to CUDA</title>
diff --git a/doc/external-libs/ginkgo.html b/doc/external-libs/ginkgo.html
index 00e4a0dea4..56fb0c1c49 100644
--- a/doc/external-libs/ginkgo.html
+++ b/doc/external-libs/ginkgo.html
@@ -1,5 +1,5 @@
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
-	  "http://www.w3.org/TR/html4/loose.dtd">
+	  "https://www.w3.org/TR/html4/loose.dtd">
 <html>
   <head>
     <title>The deal.II Readme on interfacing to Ginkgo</title>
@@ -87,10 +87,10 @@
 
     <hr />
     <div class="right">
-      <a href="http://validator.w3.org/check?uri=referer" target="_top">
-        <img style="border:0" src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
-      <a href="http://jigsaw.w3.org/css-validator/check/referer" target="_top">
-        <img style="border:0;width:88px;height:31px" src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
+      <a href="https://validator.w3.org/check?uri=referer" target="_top">
+        <img style="border:0" src="https://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
+      <a href="https://jigsaw.w3.org/css-validator/check/referer" target="_top">
+        <img style="border:0;width:88px;height:31px" src="https://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
     </div>
   </body>
 </html>
diff --git a/doc/external-libs/gsl.html b/doc/external-libs/gsl.html
index 2eaec23aa2..e68ab6c24b 100644
--- a/doc/external-libs/gsl.html
+++ b/doc/external-libs/gsl.html
@@ -1,5 +1,5 @@
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
-	  "http://www.w3.org/TR/html4/loose.dtd">
+	  "https://www.w3.org/TR/html4/loose.dtd">
 
 <html>
   <head>
@@ -14,10 +14,10 @@
     <h2>Installation of <acronym>GSL</acronym></h2>
 
     <p>
-      <a href="http://www.gnu.org/software/gsl/">GNU Scientific Library</a>
+      <a href="https://www.gnu.org/software/gsl/">GNU Scientific Library</a>
       provides a wide range of mathematical routines such as random number
   	  generators, special functions and least-squares fitting.
-      <a href="http://www.gnu.org/software/gsl/" target="_top">GSL</a>
+      <a href="https://www.gnu.org/software/gsl/" target="_top">GSL</a>
       should be readily packaged by most Linux distributions.
       Don't forget to install a development version of the library.
     </p>
@@ -59,10 +59,10 @@
 
     <hr />
     <div class="right">
-      <a href="http://validator.w3.org/check?uri=referer" target="_top">
-        <img style="border:0" src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
-      <a href="http://jigsaw.w3.org/css-validator/check/referer" target="_top">
-        <img style="border:0;width:88px;height:31px" src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
+      <a href="https://validator.w3.org/check?uri=referer" target="_top">
+        <img style="border:0" src="https://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
+      <a href="https://jigsaw.w3.org/css-validator/check/referer" target="_top">
+        <img style="border:0;width:88px;height:31px" src="https://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
     </div>
 
   </body>
diff --git a/doc/external-libs/lapack.html b/doc/external-libs/lapack.html
index bb7f9f63a1..2ce9445a19 100644
--- a/doc/external-libs/lapack.html
+++ b/doc/external-libs/lapack.html
@@ -1,5 +1,5 @@
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
-	  "http://www.w3.org/TR/html4/loose.dtd">
+	  "https://www.w3.org/TR/html4/loose.dtd">
 
 <html>
   <head>
@@ -98,10 +98,10 @@
 
     <hr />
     <div class="right">
-      <a href="http://validator.w3.org/check?uri=referer" target="_top">
-        <img style="border:0" src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
-      <a href="http://jigsaw.w3.org/css-validator/check/referer" target="_top">
-        <img style="border:0;width:88px;height:31px" src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
+      <a href="https://validator.w3.org/check?uri=referer" target="_top">
+        <img style="border:0" src="https://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
+      <a href="https://jigsaw.w3.org/css-validator/check/referer" target="_top">
+        <img style="border:0;width:88px;height:31px" src="https://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
     </div>
 
   </body>
diff --git a/doc/external-libs/opencascade.html b/doc/external-libs/opencascade.html
index 9da737de7a..9a3e6efc4a 100644
--- a/doc/external-libs/opencascade.html
+++ b/doc/external-libs/opencascade.html
@@ -1,5 +1,5 @@
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
-	  "http://www.w3.org/TR/html4/loose.dtd">
+	  "https://www.w3.org/TR/html4/loose.dtd">
 
 <html>
   <head>
@@ -13,7 +13,7 @@
 
     <h2>Installation of <acronym>OpenCASCADE</acronym></h2>
 
-    <p> <a href="http://www.opencascade.org/">OpenCASCADE</a> is a
+    <p> <a href="https://www.opencascade.org/">OpenCASCADE</a> is a
       software development kit (SDK) intended for development of
       applications dealing with 3D CAD data, freely available in open
       source. It includes a set of C++ class libraries providing
@@ -74,10 +74,10 @@ This will turn off some packages we don't need. The default package options also
 
     <hr />
     <div class="right">
-      <a href="http://validator.w3.org/check?uri=referer" target="_top">
-        <img style="border:0" src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
-      <a href="http://jigsaw.w3.org/css-validator/check/referer" target="_top">
-        <img style="border:0;width:88px;height:31px" src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
+      <a href="https://validator.w3.org/check?uri=referer" target="_top">
+        <img style="border:0" src="https://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
+      <a href="https://jigsaw.w3.org/css-validator/check/referer" target="_top">
+        <img style="border:0;width:88px;height:31px" src="https://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
     </div>
 
   </body>
diff --git a/doc/external-libs/p4est-setup.sh b/doc/external-libs/p4est-setup.sh
index 1d0975bb2d..9c2bbc45fa 100755
--- a/doc/external-libs/p4est-setup.sh
+++ b/doc/external-libs/p4est-setup.sh
@@ -15,7 +15,7 @@
 # the Free Software Foundation; either version 2 of the License, or
 # (at your option) any later version.
 #
-# [1] http://www.p4est.org
+# [1] https://www.p4est.org
 #
 
 # This program comes with ABSOLUTELY NO WARRANTY.
diff --git a/doc/external-libs/p4est.html b/doc/external-libs/p4est.html
index 794cf6b60c..0544dfa86c 100644
--- a/doc/external-libs/p4est.html
+++ b/doc/external-libs/p4est.html
@@ -1,5 +1,5 @@
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN"
-   "http://www.w3.org/TR/REC-html40/frameset.dtd">
+   "https://www.w3.org/TR/REC-html40/frameset.dtd">
 <html>
   <head>
     <title>The deal.II Readme on interfacing to p4est</title>
@@ -14,7 +14,7 @@
     <h1>Using and installing instructions for the p4est library</h1>
 
     <p>
-      <a href="http://www.p4est.org/" target="_top">p4est</a> is a
+      <a href="https://www.p4est.org/" target="_top">p4est</a> is a
       library that manages meshes that are distributed across multiple
       processors. It forms the basis of deal.II's implementation of
       finite element solvers that can use meshes that are too large to
@@ -23,7 +23,7 @@
 
     <p>
       You need to install p4est before deal.II. To do so, you can
-      download it from <a href="http://www.p4est.org/" target="_top">here</a>.
+      download it from <a href="https://www.p4est.org/" target="_top">here</a>.
       You can either choose to manually compile and install p4est (as
       explained in documentation of p4est), or alternatively use
       <a href="p4est-setup.sh">a script</a> that will automatically compile
@@ -58,10 +58,10 @@ cmake -DP4EST_DIR=/path/to/installation -DDEAL_II_WITH_P4EST=ON -DDEAL_II_WITH_M
 
     <hr />
     <div class="right">
-      <a href="http://validator.w3.org/check?uri=referer" target="_top">
-        <img style="border:0" src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
-      <a href="http://jigsaw.w3.org/css-validator/check/referer" target="_top">
-        <img style="border:0;width:88px;height:31px" src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
+      <a href="https://validator.w3.org/check?uri=referer" target="_top">
+        <img style="border:0" src="https://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
+      <a href="https://jigsaw.w3.org/css-validator/check/referer" target="_top">
+        <img style="border:0;width:88px;height:31px" src="https://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
     </div>
   </body>
 </html>
diff --git a/doc/external-libs/petsc.html b/doc/external-libs/petsc.html
index d03b8c1caf..736fdca687 100644
--- a/doc/external-libs/petsc.html
+++ b/doc/external-libs/petsc.html
@@ -1,5 +1,5 @@
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
-	  "http://www.w3.org/TR/html4/loose.dtd">
+	  "https://www.w3.org/TR/html4/loose.dtd">
 <html>
   <head>
     <title>The deal.II Readme on interfacing to PETSc</title>
@@ -13,7 +13,7 @@
     <h1>Interfacing <acronym>deal.II</acronym> to PETSc</h1>
 
     <p>
-      <a href="http://www.mcs.anl.gov/petsc/"
+      <a href="https://www.mcs.anl.gov/petsc/"
       target="_top">PETSc</a> is a
       software package that provides lots of functionality for linear
       algebra, among other things. For example, it includes implementations of a variety of
@@ -97,7 +97,7 @@
     <p>
       Installing PETSc correctly can be a bit of a
       challenge. To start, take a look at
-      the <a href="http://www.mcs.anl.gov/petsc/documentation/installation.html"
+      the <a href="https://www.mcs.anl.gov/petsc/documentation/installation.html"
       target="_top">PETSc installation instructions</a>. We have found that
       the following steps generally appear to work where we simply unpack and
       build PETSc in its final location (i.e., we do not first build and then
@@ -154,10 +154,10 @@
 
     <hr />
     <div class="right">
-      <a href="http://validator.w3.org/check?uri=referer" target="_top">
-        <img style="border:0" src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
-      <a href="http://jigsaw.w3.org/css-validator/check/referer" target="_top">
-        <img style="border:0;width:88px;height:31px" src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
+      <a href="https://validator.w3.org/check?uri=referer" target="_top">
+        <img style="border:0" src="https://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
+      <a href="https://jigsaw.w3.org/css-validator/check/referer" target="_top">
+        <img style="border:0;width:88px;height:31px" src="https://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
     </div>
   </body>
 </html>
diff --git a/doc/external-libs/slepc.html b/doc/external-libs/slepc.html
index 0b2660e2de..d7435f8649 100644
--- a/doc/external-libs/slepc.html
+++ b/doc/external-libs/slepc.html
@@ -1,5 +1,5 @@
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
-	  "http://www.w3.org/TR/html4/loose.dtd">
+	  "https://www.w3.org/TR/html4/loose.dtd">
 <html>
   <head>
     <title>The deal.II Readme on interfacing to SLEPc</title>
@@ -107,10 +107,10 @@
 
     <hr />
     <div class="right">
-      <a href="http://validator.w3.org/check?uri=referer" target="_top">
-        <img style="border:0" src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
-      <a href="http://jigsaw.w3.org/css-validator/check/referer" target="_top">
-        <img style="border:0;width:88px;height:31px" src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
+      <a href="https://validator.w3.org/check?uri=referer" target="_top">
+        <img style="border:0" src="https://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
+      <a href="https://jigsaw.w3.org/css-validator/check/referer" target="_top">
+        <img style="border:0;width:88px;height:31px" src="https://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
     </div>
   </body>
 </html>
diff --git a/doc/external-libs/trilinos.html b/doc/external-libs/trilinos.html
index 7151ab4107..823f8cff25 100644
--- a/doc/external-libs/trilinos.html
+++ b/doc/external-libs/trilinos.html
@@ -1,5 +1,5 @@
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
-	  "http://www.w3.org/TR/html4/loose.dtd">
+	  "https://www.w3.org/TR/html4/loose.dtd">
 <html>
   <head>
     <title>The deal.II Readme on interfacing to Trilinos</title>
@@ -23,7 +23,7 @@
       engines, etc. Of particular interest to deal.II is their ability to
       provide this functionality both on sequential and parallel (using MPI)
       computers.
-      Compared to <a href="http://www.mcs.anl.gov/petsc/" target="_top">PETSc</a>,
+      Compared to <a href="https://www.mcs.anl.gov/petsc/" target="_top">PETSc</a>,
       which is written in C, Trilinos is written in C++ and can be considered to
       be a more modern version of PETSc though both packages are under
       continuing development at their respective national laboratories.
@@ -74,7 +74,7 @@
         <li> Zoltan (optional).
       </ul>
 
-      Trilinos uses <a href="http://cmake.org/">cmake</a> to configure and
+      Trilinos uses <a href="https://cmake.org/">cmake</a> to configure and
       build. The following slightly longish set of commands will set up a
       reasonable configuration (<code>trilinos-x.y.z</code> is the
       version-specific path into which the
@@ -134,7 +134,7 @@
       Note: At the time of writing (November 2016) Trilinos (at least up to
       v12.8.1) cannot link against LAPACK 3.6.0 or later, due to two symbols
       that were deprecated (and removed by default) in LAPACK 3.6.0 (see the
-      <a href="http://www.netlib.org/lapack/lapack-3.6.0.html">
+      <a href="https://www.netlib.org/lapack/lapack-3.6.0.html">
       release notes</a>). To fix this, edit the Trilinos file
       <code>packages/epetra/src/Epetra_LAPACK_wrappers.h</code> and change the
       lines
@@ -176,7 +176,7 @@
     <p>
       Trilinos (via its Amesos package) can interface with a number of direct
       solvers (see, for example,
-      <a href="http://trilinos.org/docs/r11.8/packages/amesos/doc/html/index.html"
+      <a href="https://trilinos.org/docs/r11.8/packages/amesos/doc/html/index.html"
 	 target="_top">this page for Trilinos 11.8</a>). Most of them are external
       packages to Trilinos and you will need to tell Trilinos configuration
       scripts that you want to use them, for example via the
@@ -211,10 +211,10 @@
     </p>
     <hr />
     <div class="right">
-      <a href="http://validator.w3.org/check?uri=referer" target="_top">
-        <img style="border:0" src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
-      <a href="http://jigsaw.w3.org/css-validator/check/referer" target="_top">
-        <img style="border:0;width:88px;height:31px" src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
+      <a href="https://validator.w3.org/check?uri=referer" target="_top">
+        <img style="border:0" src="https://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
+      <a href="https://jigsaw.w3.org/css-validator/check/referer" target="_top">
+        <img style="border:0;width:88px;height:31px" src="https://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
     </div>
   </body>
 </html>
-- 
2.39.5

