Enable -Wundef warning
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@@ -67,7 +67,7 @@ esac
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CFLAGS="-W $CFLAGS"
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warn_CFLAGS="-std=c89 -pedantic -Wall -Wextra -Wcast-align -Wnested-externs -Wshadow -Wstrict-prototypes -Wno-unused-function -Wno-long-long -Wno-overlength-strings"
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warn_CFLAGS="-std=c89 -pedantic -Wall -Wextra -Wcast-align -Wnested-externs -Wshadow -Wstrict-prototypes -Wundef -Wno-unused-function -Wno-long-long -Wno-overlength-strings"
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saved_CFLAGS="$CFLAGS"
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CFLAGS="$warn_CFLAGS $CFLAGS"
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AC_MSG_CHECKING([if ${CC} supports ${warn_CFLAGS}])
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