[mutter/wip/lantw/wayland-on-freebsd: 7/9] build: Use portable sed syntax in src/Makefile.am

[Jonas Ådahl <jadahl src gnome org>]

commit 62b33630956bb61f05f062cf56738eed9a387026
Author: Ting-Wei Lan <lantw src gnome org>
Date:   Sun Jan 7 03:05:51 2018 +0800

    build: Use portable sed syntax in src/Makefile.am
    
    Replace non-portable \<, \>, \+ with \(, \), \{, \} to avoid build
    failure on systems not using GNU sed.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=792280

 src/Makefile.am | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index 15fb98c5e..f345804ec 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -736,11 +736,11 @@ backends/native/meta-default-modes.h: backends/native/gen-default-modes.py Makef
 .SECONDEXPANSION:
 
 define protostability
-$(shell echo $1 | sed 's/.*\(\<unstable\>\|\<stable\>\).*/\1/')
+$(shell echo $1 | sed 's/.*-\(\(un\)\{0,1\}stable\)-.*/\1/')
 endef
 
 define protoname
-$(shell echo $1 | sed 's/\([a-z\-]\+\)-[a-z]\+-v[0-9]\+/\1/')
+$(shell echo $1 | sed 's/\([a-z\-]\{1,\}\)-[a-z]\{1,\}-v[0-9]\{1,\}/\1/')
 endef
 
 %-protocol.c : $(WAYLAND_PROTOCOLS_DATADIR)/$$(call protostability,$$*)/$$(call protoname,$$*)/$$*.xml