diff --git a/gitlab/build-crosstest b/gitlab/build-crosstest
index 5561bffb..15b4d031 100755
--- a/gitlab/build-crosstest
+++ b/gitlab/build-crosstest
@@ -14,7 +14,7 @@ set -Eeuxo pipefail
 rm -fr build
 mkdir build
 cd build
-../configure CROSSCC32="i686-w64-mingw32-gcc -Wno-array-bounds" CROSSCC64="x86_64-w64-mingw32-gcc -Wno-array-bounds" && \
+../configure CROSSCC32="i686-w64-mingw32-gcc" CROSSCC64="x86_64-w64-mingw32-gcc" CFLAGS="-g -O2 -Wno-array-bounds -Werror" && \
     make -j$(nproc) crosstest || \
         touch ../pipeline_failed
 
diff --git a/gitlab/build-linux b/gitlab/build-linux
index 566d772f..cc8faa5b 100755
--- a/gitlab/build-linux
+++ b/gitlab/build-linux
@@ -11,7 +11,7 @@ set -Eeuxo pipefail
 rm -fr build
 mkdir build
 cd build
-../configure --enable-demos && \
+../configure --enable-demos CFLAGS="-g -O2 -Werror" && \
     make -j$(nproc) && \
     make -j$(nproc) check || \
         touch ../pipeline_failed
diff --git a/gitlab/build-mac b/gitlab/build-mac
index 23c1ea96..aeed0988 100755
--- a/gitlab/build-mac
+++ b/gitlab/build-mac
@@ -11,7 +11,7 @@ set -Eeuxo pipefail
 rm -fr build
 mkdir build
 cd build
-../configure && \
+../configure CFLAGS="-g -O2 -Wno-implicit-fallthrough -Wno-enum-conversion -Werror" && \
     make -j$(sysctl -n hw.ncpu) && \
     make -j$(sysctl -n hw.ncpu) check || \
         touch ../pipeline_failed
diff --git a/gitlab/build-mingw b/gitlab/build-mingw
index 0f9ab3a6..f06e3861 100755
--- a/gitlab/build-mingw
+++ b/gitlab/build-mingw
@@ -13,7 +13,7 @@ mkdir build
 cd build
 mkdir vulkan-headers
 cp -r /usr/include/vulkan /usr/include/vk_video /usr/include/spirv vulkan-headers
-../configure --enable-demos --disable-doxygen-doc --without-ncurses --host=$HOST SONAME_LIBVULKAN="vulkan-1.dll" CPPFLAGS="-I$PWD/vulkan-headers" CFLAGS="-g -O2 -Wno-format -Wno-array-bounds" LDFLAGS="-static-libgcc" && \
+../configure --enable-demos --disable-doxygen-doc --without-ncurses --host=$HOST SONAME_LIBVULKAN="vulkan-1.dll" CPPFLAGS="-I$PWD/vulkan-headers" CFLAGS="-g -O2 -Wno-format -Wno-array-bounds -Wno-missing-prototypes -Wno-discarded-qualifiers -Wno-incompatible-pointer-types -Werror" LDFLAGS="-static-libgcc" && \
     make -j$(nproc) && \
     make -j$(nproc) install DESTDIR="$PWD/destdir" || \
         touch ../pipeline_failed