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_AC_C_IFDEF(MACRO-NAME, ACTION-IF-DEF, ACTION-IF-NOT-DEF)
Check for the definition of macro MACRO-NAME using the current language's compiler.
Ludovic Courtès <ludo@chbouib.org>
2004-09-07
AC_DEFUN([_AC_C_IFDEF],
[AC_COMPILE_IFELSE([#ifndef $1
# error "Macro $1 is undefined!"
/* For some compilers (eg. SGI's CC), #error is not
enough... */
please, do fail
#endif],
[$2], [$3])])
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