[PATCH] Use POSIX sed invocation

[Robin Green]

Fixes broken build on DragonFly BSD

Signed-off-by: Robin Green <greenrd at greenrd.org>
---
 lib/Makefile.local |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/lib/Makefile.local b/lib/Makefile.local
index fe42920..88d8deb 100644
--- a/lib/Makefile.local
+++ b/lib/Makefile.local
@@ -76,7 +76,7 @@ $(dir)/$(LIBNAME): $(libnotmuch_modules) notmuch.sym
 
 notmuch.sym: lib/notmuch.h
 	printf "{\nglobal:\n" > notmuch.sym
-	sed  -n 's/^\s*\(notmuch_[a-z_]*\)\s*(.*/\t\1;/p' $< >> notmuch.sym
+	sed  -n 's/^[[:space:]]*\(notmuch_[a-z_]*\)[[:space:]]*(.*/'"`printf "\t"`"'\1;/p' $< >> notmuch.sym
 	printf "local: *;\n};\n" >> notmuch.sym
 
 $(dir)/$(SONAME): $(dir)/$(LIBNAME)
-- 
1.7.4.1