diff --git a/.github/workflows/many-platforms.yml b/.github/workflows/many-platforms.yml
index af98208..4458efc 100644
--- a/.github/workflows/many-platforms.yml
+++ b/.github/workflows/many-platforms.yml
@@ -143,7 +143,7 @@ jobs:
             pwd
             : "Install CentOS Linux packages"
             : "List of packages: http://mirror.centos.org/centos/7/os/x86_64/Packages/"
-            yum -y install m4 make gcc
+            yum -y install m4 automake make gcc gcc-c++ gcc-gfortran
             cd /work
             ls -l
             export CPPFLAGS="-Wall"
@@ -186,7 +186,7 @@ jobs:
             pwd
             : "Install Alpine Linux packages"
             : "List of packages: https://pkgs.alpinelinux.org/packages"
-            apk add m4 make gcc musl-dev
+            apk add m4 automake make gcc musl-dev g++ gfortran
             cd /work
             ls -l
             export CPPFLAGS="-Wall"
@@ -229,7 +229,7 @@ jobs:
       - run: pwd
       # Install Homebrew packages.
       # List of packages: https://formulae.brew.sh/
-      - run: brew install gcc
+      - run: brew install m4 automake gfortran
       - run: |
           pwd
           export CPPFLAGS="-Wall"
@@ -277,7 +277,7 @@ jobs:
             pwd
             : "Install FreeBSD packages"
             : "List of packages: https://ports.freebsd.org/cgi/ports.cgi"
-            pkg install -y m4
+            pkg install -y m4 automake gcc
             ls -l
             export CPPFLAGS="-I/usr/local/include -Wall"
             export LDFLAGS="-L/usr/local/lib"
@@ -323,10 +323,10 @@ jobs:
             pwd
             : "Install NetBSD packages"
             : "List of packages: https://ftp.netbsd.org/pub/pkgsrc/current/pkgsrc/index-all.html"
-            pkg_add m4
+            : pkg_add m4
             : "or"
             : pkg_add pkgin
-            : pkgin install ...
+            pkgin install m4
             ls -l
             export CPPFLAGS="-I/usr/pkg/include -Wall"
             export LDFLAGS="-L/usr/pkg/lib"
@@ -373,11 +373,11 @@ jobs:
             pwd
             : "Install OpenBSD packages"
             : "List of packages: https://cdn.openbsd.org/pub/OpenBSD/7.5/packages/amd64/"
-            pkg_add m4
+            pkg_add m4 gmake
             ls -l
             export CPPFLAGS="-I/usr/local/include -Wall"
             export LDFLAGS="-L/usr/local/lib"
-            ./build-on.sh '${{ env.package }}' '' 'make'
+            ./build-on.sh '${{ env.package }}' '' 'gmake'
       # Doc: https://docs.github.com/en/actions/using-workflows/storing-workflow-data-as-artifacts
       #      https://github.com/actions/upload-artifact?tab=readme-ov-file#usage
       - if: ${{ always() }}
@@ -424,6 +424,7 @@ jobs:
             ls -l
             export CPPFLAGS="-Wall"
             export CC="gcc -m64"
+            export CXX="g++ -m64"
             ./build-on.sh '${{ env.package }}' '' 'make'
       # Doc: https://docs.github.com/en/actions/using-workflows/storing-workflow-data-as-artifacts
       #      https://github.com/actions/upload-artifact?tab=readme-ov-file#usage
@@ -461,6 +462,7 @@ jobs:
             : "Install Solaris packages"
             : "List of packages: https://pkg.omnios.org/r151048/core/en/index.shtml"
             pkg install \
+                developer/build/automake \
                 developer/gcc13 developer/object-file system/header system/library/math \
                 developer/build/gnu-make
           run: |
@@ -515,7 +517,7 @@ jobs:
           platform: ${{ matrix.bitness == 32 && 'x86' || 'x86_64' }}
           # Install Cygwin packages.
           # List of packages: https://cygwin.com/packages/package_list.html
-          packages: m4 gcc-core make
+          packages: m4 automake gcc-core make
       - name: cygcheck
         run: cygcheck -V
       - name: cygcheck
@@ -579,7 +581,7 @@ jobs:
           platform: x86_64
           # Install Cygwin packages.
           # List of packages: https://cygwin.com/packages/package_list.html
-          packages: m4 ${{ matrix.bitness == 32 && 'mingw64-i686-gcc-core mingw64-i686-headers mingw64-i686-runtime' || 'mingw64-x86_64-gcc-core mingw64-x86_64-headers mingw64-x86_64-runtime' }} make
+          packages: m4 automake ${{ matrix.bitness == 32 && 'mingw64-i686-gcc-core mingw64-i686-headers mingw64-i686-runtime' || 'mingw64-x86_64-gcc-core mingw64-x86_64-headers mingw64-x86_64-runtime' }} make
       - name: cygcheck
         run: cygcheck -V
       - name: cygcheck
@@ -650,7 +652,7 @@ jobs:
           platform: x86_64
           # Install Cygwin packages.
           # List of packages: https://cygwin.com/packages/package_list.html
-          packages: wget m4 make
+          packages: wget m4 automake make
       - name: cygcheck
         run: cygcheck -V
       - name: cygcheck