# | |
# Check for FLEX. | |
# | |
# This macro verifies that flex is installed. If successful, then | |
# 1) $LEX is set to "flex" (to emulate lex calls) | |
# 2) BISON is set to bison | |
AC_DEFUN([AC_PROG_FLEX], | |
[AC_CACHE_CHECK(, | |
ac_cv_has_flex, | |
[AC_PROG_LEX() | |
]) | |
if test "$LEX" != "flex"; then | |
AC_MSG_ERROR([flex not found but required]) | |
else | |
AC_SUBST(FLEX,[flex],[location of flex]) | |
fi | |
]) |