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build: require Flex.

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* configure.ac: Require Flex.
This commit is contained in:
Akim Demaille
2012-04-10 21:36:23 +02:00
parent 0d49053a75
commit 10232af808
1 changed files with 3 additions and 0 deletions
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3
configure.ac
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@@ -114,6 +114,9 @@ AC_SUBST([YACC_LIBRARY])
# Checks for programs.
AC_PROG_LEX
if test "$FLEX" != yes; then
AC_MSG_ERROR([Flex is required])
fi
AC_PROG_YACC
AC_PROG_RANLIB
AC_PROG_GNU_M4