Merge pull request #16 from oshogbo/master

Fix compilation on systems without capser.

Makefile

@@ -2,6 +2,8 @@
 # and set env variable LIB9P_LOGGING to stderr or to
 # the (preferably full path name of) the debug log file.
 
+.include <src.opts.mk>
+
 LIB=		9p
 SHLIB_MAJOR=	1
 SRCS=		pack.c \
@@ -17,8 +19,14 @@ SRCS=		pack.c \
 
 INCS=		lib9p.h
 CC=		clang
-CFLAGS=		-g -O0 -DL9P_DEBUG=L9P_DEBUG -DWITH_CASPER
-LIBADD=		sbuf libcasper libcap_pwd libcap_grp
+CFLAGS=		-g -O0 -DL9P_DEBUG=L9P_DEBUG
+LIBADD=		sbuf
+
+.if ${MK_CASPER} != "no"
+LIBADD+=	libcasper libcap_pwd libcap_grp
+CFLAGS+=	-DWITH_CASPER
+.endif
+
 SUBDIR=		example
 
 cscope: .PHONY