Index: share/mk/src.opts.mk
===================================================================
--- share/mk/src.opts.mk
+++ share/mk/src.opts.mk
@@ -100,7 +100,6 @@
     GNU \
     GNU_DIFF \
     GNU_GREP \
-    GNU_GREP_COMPAT \
     GPIO \
     GPL_DTC \
     GROFF \
@@ -182,6 +181,7 @@
     BSD_GREP \
     CLANG_EXTRAS \
     DTRACE_TESTS \
+    GNU_GREP_COMPAT \
     HESIOD \
     LIBSOFT \
     NAND \
Index: tools/build/options/WITHOUT_GNU_GREP_COMPAT
===================================================================
--- tools/build/options/WITHOUT_GNU_GREP_COMPAT
+++ /dev/null
@@ -1,3 +0,0 @@
-.\" $FreeBSD$
-Set this option to omit the gnu extensions to grep from being included in
-BSD grep.
Index: tools/build/options/WITH_GNU_GREP_COMPAT
===================================================================
--- /dev/null
+++ tools/build/options/WITH_GNU_GREP_COMPAT
@@ -0,0 +1,3 @@
+.\" $FreeBSD$
+Set this option to include the GNU extensions in BSD grep by linking against
+libgnuregex, which is licensed under the LGPL.