fix c/flags

proton-ge-custom/PKGBUILD

@@ -35,6 +35,7 @@ depends=(
   python
   steam
   cabextract
+  vkd3d            lib32-vkd3d
 )
 
 makedepends=(autoconf bison perl fontforge flex mingw-w64-gcc
@@ -287,7 +288,6 @@ prepare() {
         # Adds more 16:10 resolutions for use with FSR
         patch -p1 -i "$srcdir"/wine-more_8x5_res.patch
     popd
-
     patch -p1 -i "$srcdir"/proton-sanitize_makefile.patch
     patch -p1 -i "$srcdir"/proton-disable_lock.patch
     patch -p1 -i "$srcdir"/proton-user_compat_data.patch
@@ -304,7 +304,6 @@ prepare() {
 build() {
     source build_venv/bin/activate
     export PATH="$(pwd)/wrappers:$PATH"
-
     cd build
     ROOTLESS_CONTAINER="" \
     ../proton-ge-custom/configure.sh \
@@ -351,8 +350,8 @@ build() {
     # https://bugs.winehq.org/show_bug.cgi?id=43516
     # AVX is "hard" disabled for 32bit in any case.
     # AVX2 for 64bit is disabled below.
-    export CFLAGS+=" -mno-avx2"
-    export CXXFLAGS+=" -mno-avx2"
+    export CFLAGS+=" -mno-avx2 -I/usr/include/vkd3d"
+    export CXXFLAGS+=" -mno-avx2 -I/usr/include/vkd3d"
 
     export WINEESYNC=0
     export WINEFSYNC=0