Index: head/share/man/man5/src.conf.5
===================================================================
--- head/share/man/man5/src.conf.5
+++ head/share/man/man5/src.conf.5
@@ -732,9 +732,10 @@
 .It Va WITHOUT_GNU_GREP
 Set to not build GNU
 .Xr grep 1 .
-.It Va WITHOUT_GNU_GREP_COMPAT
-Set this option to omit the gnu extensions to grep from being included in
-BSD grep.
+.It Va WITH_GNU_GREP_COMPAT
+Set this option to include GNU extensions in
+.Xr bsdgrep 1
+by linking against libgnuregex.
 .It Va WITHOUT_GPIO
 Set to not build
 .Xr gpioctl 8
Index: head/share/mk/src.opts.mk
===================================================================
--- head/share/mk/src.opts.mk
+++ head/share/mk/src.opts.mk
@@ -99,7 +99,6 @@
     GCOV \
     GNU_DIFF \
     GNU_GREP \
-    GNU_GREP_COMPAT \
     GPIO \
     GPL_DTC \
     GROFF \
@@ -181,6 +180,7 @@
     BSD_GREP \
     CLANG_EXTRAS \
     DTRACE_TESTS \
+    GNU_GREP_COMPAT \
     HESIOD \
     LIBSOFT \
     NAND \
Index: head/tools/build/options/WITH_GNU_GREP_COMPAT
===================================================================
--- head/tools/build/options/WITH_GNU_GREP_COMPAT
+++ head/tools/build/options/WITH_GNU_GREP_COMPAT
@@ -0,0 +1,4 @@
+.\" $FreeBSD$
+Set this option to include GNU extensions in
+.Xr bsdgrep 1
+by linking against libgnuregex.