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-rw-r--r--mkspecs/common/clang.conf1
1 files changed, 1 insertions, 0 deletions
diff --git a/mkspecs/common/clang.conf b/mkspecs/common/clang.conf
index ace2496f10..d58b44b295 100644
--- a/mkspecs/common/clang.conf
+++ b/mkspecs/common/clang.conf
@@ -13,6 +13,7 @@ QMAKE_LINK_SHLIB = $$QMAKE_CXX
CONFIG += clang_pch_style
QMAKE_PCH_OUTPUT_EXT = .pch
+QMAKE_CFLAGS_ISYSTEM = -isystem
QMAKE_CFLAGS_PRECOMPILE = -x c-header -c ${QMAKE_PCH_INPUT} -o ${QMAKE_PCH_OUTPUT}
QMAKE_CFLAGS_USE_PRECOMPILE = -Xclang -include-pch -Xclang ${QMAKE_PCH_OUTPUT}
QMAKE_CXXFLAGS_PRECOMPILE = -x c++-header -c ${QMAKE_PCH_INPUT} -o ${QMAKE_PCH_OUTPUT}