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-rw-r--r--mkspecs/common/clang.conf1
1 files changed, 0 insertions, 1 deletions
diff --git a/mkspecs/common/clang.conf b/mkspecs/common/clang.conf
index 2499c8b6d8..dad15a22a8 100644
--- a/mkspecs/common/clang.conf
+++ b/mkspecs/common/clang.conf
@@ -18,7 +18,6 @@ QMAKE_PCH_OUTPUT_EXT = .pch
QMAKE_CFLAGS_OPTIMIZE_SIZE = -Oz
-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_CFLAGS_LTCG = -flto=thin