--- /dev/null
+--- configure.ac 2018-11-29 13:51:14.495012138 +0100
++++ configure.ac 2018-11-29 13:51:45.308095312 +0100
+@@ -10,7 +10,6 @@
+ LT_INIT
+ #AC_CANONICAL_HOST
+
+-CFLAGS=
+ default_fink_path=/sw
+ case $host_os in
+ darwin*)
+@@ -78,20 +77,7 @@
+ AC_PROG_MAKE_SET
+
+ AC_PROG_LEX
+-if test "x$LEX" != xflex; then
+- echo "************************"
+- echo "flex not found"
+- echo "************************"
+- exit -1
+-fi
+-
+ AC_PROG_YACC
+-if test "x$YACC" != "xbison -y"; then
+- echo "************************"
+- echo "bison not found"
+- echo "************************"
+- exit -1
+-fi
+
+ # Checks for libraries.
+ lib_err_msg="add its path to LDFLAGS\nsee ./configure --help"
+@@ -121,13 +134,6 @@
+
+ CFLAGS="$CFLAGS -Wall -W -Wfloat-equal -Wpointer-arith -Wcast-align -Wstrict-prototypes -Wredundant-decls \
+ -Wendif-labels -Wshadow -pipe -ffast-math -U__STRICT_ANSI__ -std=gnu99"
+-if test "$with_debug" == "y"; then
+- CFLAGS="$CFLAGS -g3 -O0"
+-elif test "$with_enable_optimized" != "no"; then
+- CFLAGS="$CFLAGS -g -O2"
+-else
+- CFLAGS="$CFLAGS -fomit-frame-pointer -O3"
+-fi
+
+ if test "$with_safe_clean" != "n"; then
+ CFLAGS="$CFLAGS -DSAFE_CLEAN"