configure.ac: fail if flex is not found

Thanks to Ian Norton for the bug report Closes #124
LudovicRousseau · Mar 25, 2022 · 3f89340 · 3f89340
1 parent dfd05d5
commit 3f89340
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/configure.ac b/configure.ac
@@ -61,6 +61,10 @@ AC_PROG_INSTALL
 AC_PROG_LN_S
 AC_PROG_MAKE_SET
 AC_PROG_LEX([noyywrap])
+if test $LEX = ":"
+then
+ AC_MSG_ERROR([no lex or flex found])
+fi
 PKG_PROG_PKG_CONFIG
 AM_PROG_CC_C_O
 AM_PROG_AR