diff --git a/gui/libs/gtk3/ympbuild b/gui/libs/gtk3/ympbuild
index c755f394..8ae16f6e 100644
--- a/gui/libs/gtk3/ympbuild
+++ b/gui/libs/gtk3/ympbuild
@@ -11,7 +11,7 @@ source=("https://download.gnome.org/sources/gtk+/${version:0:4}/gtk+-${version}.
         "gtk3.sysconf")
 depends=(cairo libXi libXext libXfixes libXcursor libXdamage librsvg at-spi2-core
          shared-mime-info gdk-pixbuf libxkbcommon libepoxy colord libcloudproviders
-         dconf cantarell-fonts libpng)
+         dconf cantarell-fonts libpng libXcomposite)
 makedepends=()
 md5sums=('3649dd48556ead2d909467c1f0751956'
          'SKIP')
@@ -19,6 +19,9 @@ group=()
 uses=()
 arch=('x86_64')
 
+unset CFLAGS
+unset CXXFLAGS
+
 cd gtk+-$version
 export XDG_DATA_DIRS=/usr/share
 setup(){