diff --git a/.ci/build-cs b/.ci/build-cs
index 00aa20b..e3f0136 100755
--- a/.ci/build-cs
+++ b/.ci/build-cs
@@ -12,7 +12,7 @@ current_triplet=`$CC -dumpmachine`
 if [ "$CC" = "clang" ]; then
     export CXX="clang++"
 else
-    export CXX="g++"
+    export CXX="g++-10"
 fi
 
 if [ "$TARGET" != "darwin" -a "$CC" != "clang" -a "$expected_triplet" != "$current_triplet" ]; then
diff --git a/.ci/build-cs-windows b/.ci/build-cs-windows
index 1db7d49..6251ce2 100755
--- a/.ci/build-cs-windows
+++ b/.ci/build-cs-windows
@@ -12,7 +12,7 @@ if [ -n "$BUILDTYPE" ]; then
 fi
 
 mkdir -p build
-cd build-
+cd build
 
 cmd.exe //C 'C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Auxiliary\Build\vcvars64.bat' amd64 '&&' \
 meson .. ${args} '&&' \
diff --git a/.ci/install-env b/.ci/install-env
index df3547a..b27c5f2 100755
--- a/.ci/install-env
+++ b/.ci/install-env
@@ -62,7 +62,9 @@ if [ "$(uname -s)" != "Linux" ]; then
     exit 0
 fi
 
-current_triplet=`gcc -dumpmachine`
+sudo apt-get install gcc-10 g++-10 || exit 1
+
+current_triplet=`gcc-10 -dumpmachine`
 
 if [ -z "$current_triplet" ]; then
     echo "ERROR: Native compiler not present!"
@@ -83,6 +85,6 @@ else
     extra_packages="qemu-user"
 fi
 
-sudo apt-get install gcc-${gcc_suffix} g++-${gcc_suffix} ${extra_packages} || exit 1
+sudo apt-get install gcc-10-${gcc_suffix} g++-10-${gcc_suffix} ${extra_packages} || exit 1
 
 exit $?
diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index fbf952c..196f18c 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -9,7 +9,6 @@ jobs:
 
     env:
       TARGET: '${{ matrix.config.target }}'
-      LUA_VERSIONS: '5.4.2 5.3.6 5.2.4 5.1.5'
       CC: '${{ matrix.config.cc }}'
       BUILDTYPE: '${{ matrix.config.buildtype }}'
 
@@ -17,26 +16,26 @@ jobs:
       matrix:
         config:
           # x86_64: test gcc, clang, + release mode to catch assert bugs
-          - { target: x86_64-linux-gnu, cc: gcc, buildtype: debugoptimized }
-          - { target: x86_64-linux-gnu, cc: gcc, buildtype: release }
+          - { target: x86_64-linux-gnu, cc: gcc-10, buildtype: debugoptimized }
+          - { target: x86_64-linux-gnu, cc: gcc-10, buildtype: release }
           - { target: x86_64-linux-gnu, cc: clang, buildtype: debugoptimized }
           # 32-bit x86
-          - { target: i686-linux-gnu, cc: gcc, buildtype: debugoptimized }
+          - { target: i686-linux-gnu, cc: gcc-10, buildtype: debugoptimized }
           # all powerpc
-          - { target: powerpc64le-linux-gnu, cc: gcc, buildtype: debugoptimized }
-          - { target: powerpc64-linux-gnu, cc: gcc, buildtype: debugoptimized }
-          - { target: powerpc-linux-gnu, cc: gcc, buildtype: debugoptimized }
+          - { target: powerpc64le-linux-gnu, cc: gcc-10, buildtype: debugoptimized }
+          - { target: powerpc64-linux-gnu, cc: gcc-10, buildtype: debugoptimized }
+          - { target: powerpc-linux-gnu, cc: gcc-10, buildtype: debugoptimized }
           # aarch64 and arm
-          - { target: aarch64-linux-gnu, cc: gcc, buildtype: debugoptimized }
-          - { target: arm-linux-gnueabi, cc: gcc, buildtype: debugoptimized }
+          - { target: aarch64-linux-gnu, cc: gcc-10, buildtype: debugoptimized }
+          - { target: arm-linux-gnueabi, cc: gcc-10, buildtype: debugoptimized }
           # riscv64 and s390x
-          - { target: riscv64-linux-gnu, cc: gcc, buildtype: debugoptimized }
-          - { target: s390x-linux-gnu, cc: gcc, buildtype: debugoptimized }
+          - { target: riscv64-linux-gnu, cc: gcc-10, buildtype: debugoptimized }
+          - { target: s390x-linux-gnu, cc: gcc-10, buildtype: debugoptimized }
           # mips, m68k
-          - { target: mips-linux-gnu, cc: gcc, buildtype: debugoptimized }
-          - { target: m68k-linux-gnu, cc: gcc, buildtype: debug }
+          - { target: mips-linux-gnu, cc: gcc-10, buildtype: debugoptimized }
+          - { target: m68k-linux-gnu, cc: gcc-10, buildtype: debug }
           # x86_64 windows cross, release mode
-          - { target: x86_64-w64-mingw32, cc: gcc, buildtype: release }
+          - { target: x86_64-w64-mingw32, cc: gcc-10, buildtype: release }
 
     steps:
       - name: Checkout