Commit 17d4002

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Check if the macro AC_PROG_CC_C99 actually made the compiler accept C99 code. (#6317)

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`@@ -128,6 +128,17 @@ AS_VAR_IF([cross_compiling], [yes],`
`128`	`128`	`AC_MSG_RESULT([$BUILD_CC])],`
`129`	`129`	`[BUILD_CC=$CC])`
`130`	`130`
	`131`	`+dnl The macro AC_PROG_CC_C99 sets the shell variable ac_cv_prog_cc_c99 to 'no'`
	`132`	`+dnl if the compiler does not support C99.i.e. does not support any of _Bool,`
	`133`	`+dnl flexible arrays, inline, long long int, mixed code and declarations,`
	`134`	`+dnl named initialization of structs, restrict, varargs macros, variable`
	`135`	`+dnl declarations in for loops and variable length arrays.`
	`136`	`+dnl`
	`137`	`+dnl https://www.gnu.org/software/autoconf/manual/autoconf-2.60/html_node/C-Compiler.html`
	`138`	`+if test "$ac_cv_prog_cc_c99" = no; then`
	`139`	`+ AC_MSG_ERROR([C compiler would not accept C99 code])`
	`140`	`+fi`
	`141`	`+`
`131`	`142`	`dnl Support systems with system libraries in e.g. /usr/lib64.`
`132`	`143`	`PHP_ARG_WITH([libdir],`
`133`	`144`	`[for system library directory],`

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