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gcc-wrapper: Use -isystem instead of -I
This mostly matters for "gcc -MMD", which distinguishes between user and system header files.
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@ -1,6 +1,6 @@
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addCVars () {
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if test -d $1/include; then
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export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -I$1/include"
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export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -isystem $1/include"
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fi
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if test -d $1/lib64; then
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