diff --git a/libraries/qt6gtk2/qt6gtk2.SlackBuild b/libraries/qt6gtk2/qt6gtk2.SlackBuild
index 230fafae6a0..670ab4be6a9 100644
--- a/libraries/qt6gtk2/qt6gtk2.SlackBuild
+++ b/libraries/qt6gtk2/qt6gtk2.SlackBuild
@@ -76,6 +76,9 @@ find -L . \
   \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
    -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;
 
+# source manually
+. /etc/profile.d/qt6.sh
+
 QMAKE_CFLAGS_RELEASE="$SLKCFLAGS" \
 QMAKE_CXXFLAGS_RELEASE="$SLKCFLAGS" \
 PREFIX=/usr \