[PATCH] Support OpenBSD

[Austin Clements]

OpenBSD's build flags are identical to FreeBSD, except that libraries
need to be explicitly linked against libc.  No code changes are
necessary.

From: Cody Cutler <ccutler at csail.mit.edu>
---
 configure          |    6 +++++-
 lib/Makefile.local |    3 +++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/configure b/configure
index acb90a8..232d847 100755
--- a/configure
+++ b/configure
@@ -378,6 +378,10 @@ elif [ $uname = "FreeBSD" ] ; then
     printf "FreeBSD.\n"
     platform=FREEBSD
     linker_resolves_library_dependencies=0
+elif [ $uname = "OpenBSD" ] ; then
+    printf "OpenBSD.\n"
+    platform=OPENBSD
+    linker_resolves_library_dependencies=0
 elif [ $uname = "Linux" ] || [ $uname = "GNU" ] ; then
     printf "$uname\n"
     platform="$uname"
@@ -667,7 +671,7 @@ HAVE_GETLINE = ${have_getline}
 # build its own version)
 HAVE_STRCASESTR = ${have_strcasestr}
 
-# Supported platforms (so far) are: LINUX, MACOSX, SOLARIS, FREEBSD
+# Supported platforms (so far) are: LINUX, MACOSX, SOLARIS, FREEBSD, OPENBSD
 PLATFORM = ${platform}
 
 # Whether the linker will automatically resolve the dependency of one
diff --git a/lib/Makefile.local b/lib/Makefile.local
index 8a9aa28..34e998f 100644
--- a/lib/Makefile.local
+++ b/lib/Makefile.local
@@ -31,6 +31,9 @@ LINKER_NAME = libnotmuch.$(LIBRARY_SUFFIX)
 SONAME = $(LINKER_NAME).$(LIBNOTMUCH_VERSION_MAJOR)
 LIBNAME = $(SONAME).$(LIBNOTMUCH_VERSION_MINOR).$(LIBNOTMUCH_VERSION_RELEASE)
 LIBRARY_LINK_FLAG = -shared -Wl,--version-script=notmuch.sym,-soname=$(SONAME) -Wl,--no-undefined
+ifeq ($(PLATFORM),OPENBSD)
+LIBRARY_LINK_FLAG += -lc
+endif
 ifeq ($(LIBDIR_IN_LDCONFIG),1)
 ifeq ($(DESTDIR),)
 LIBRARY_INSTALL_POST_COMMAND=ldconfig
-- 
1.7.10