Use $GCC instead of undocumented autoconf internal $ac_cv_c_compiler_gnu
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@ -24,7 +24,7 @@ AC_PROG_YACC
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AS=${AS-as}
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AC_SUBST(AS)
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if test "$ac_cv_c_compiler_gnu" = yes; then
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if test "$GCC" = yes; then
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CFLAGS="$CFLAGS -fPIC -DPIC -D_GNU_SOURCE -D_REENTRANT -Wall -Wpointer-arith -Wstrict-prototypes -Wmissing-prototypes -Wno-char-subscripts"
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cflags_to_try="-fno-strict-aliasing"
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AC_MSG_CHECKING([supported compiler flags])
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