diff --git a/ChangeLog b/ChangeLog
index b1770bf4b..e8fa86033 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2010-04-10  BVK Chaitanya  <bvk.groups@gmail.com>
+
+	Fix FreeBSD build.
+
+	* configure.ac: Flex version check.
+	* conf/common.rmk: Add -Wno-error to sh.mod.
+	* script/yylex.l: Remove all #pragma.
+
 2010-04-10  Vladimir Serbinenko  <phcoder@gmail.com>
 
 	* include/grub/util/misc.h (canonicalise_file_name): Add missing
diff --git a/conf/common.rmk b/conf/common.rmk
index 9987011a1..952be558c 100644
--- a/conf/common.rmk
+++ b/conf/common.rmk
@@ -656,7 +656,7 @@ normal_mod_LDFLAGS = $(COMMON_LDFLAGS)
 # For sh.mod.
 sh_mod_SOURCES = script/main.c script/script.c script/execute.c \
 	script/function.c script/lexer.c grub_script.tab.c grub_script.yy.c
-sh_mod_CFLAGS = $(COMMON_CFLAGS) $(POSIX_CFLAGS)
+sh_mod_CFLAGS = $(COMMON_CFLAGS) $(POSIX_CFLAGS) -Wno-error
 sh_mod_LDFLAGS = $(COMMON_LDFLAGS)
 
 ifneq (, $(FONT_SOURCE))
diff --git a/configure.ac b/configure.ac
index a31264685..cabae08e3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -170,11 +170,6 @@ if test "x$CMP" = x; then
   AC_MSG_ERROR([cmp is not found])
 fi
 
-AC_CHECK_PROGS([LEX], [flex])
-if test "x$LEX" = x; then
-  AC_MSG_ERROR([flex is not found])
-fi
-
 AC_CHECK_PROGS([YACC], [bison])
 if test "x$YACC" = x; then
   AC_MSG_ERROR([bison is not found])
@@ -189,9 +184,21 @@ done
 
 AC_PROG_INSTALL
 AC_PROG_AWK
+AC_PROG_LEX
 AC_PROG_MAKE_SET
 AC_PROG_MKDIR_P
 
+if test "x$LEX" = x; then
+  AC_MSG_ERROR([flex is not found])
+else
+  version=`$LEX --version | $AWK '{ split($NF,x,"."); print x[[1]]*10000+x[[2]]*100+x[[3]]; }'`
+  if test -n "$version" -a "$version" -ge 20535; then
+    :
+  else
+    AC_MSG_ERROR([flex is too old. GRUB requires 2.5.35 or above])
+  fi
+fi
+
 # These are not a "must".
 AC_PATH_PROG(RUBY, ruby)
 AC_PATH_PROG(MAKEINFO, makeinfo)
diff --git a/script/yylex.l b/script/yylex.l
index 4d7c66448..0cf33c951 100644
--- a/script/yylex.l
+++ b/script/yylex.l
@@ -86,12 +86,6 @@ typedef size_t yy_size_t;
 #define exit(...)
 #endif
 
-#pragma GCC diagnostic warning "-Wunused-variable"
-#pragma GCC diagnostic warning "-Wunused-function"
-#pragma GCC diagnostic warning "-Wunused-parameter"
-#pragma GCC diagnostic warning "-Wstrict-prototypes"
-#pragma GCC diagnostic warning "-Wmissing-prototypes"
-
 }
 
 %option ecs