--- src/FreeBSD/Makefile.orig	2017-03-13 18:07:09 UTC
+++ src/FreeBSD/Makefile
@@ -1,22 +1,22 @@
 # This software is distributed under the following license:
 # http://host-sflow.sourceforge.net/license.html
 
-.if empty $(BINDIR)
+.if empty(BINDIR)
    BINDIR=/usr/sbin
 .endif
 
-.if empty $(INITDIR)
+.if empty(INITDIR)
    INITDIR=/etc/rc.d
 .endif
 
-.if empty $(CONFDIR)
+.if empty(CONFDIR)
    CONFDIR=/etc
 .endif
 
 INSTALL=install
 
 # INSTROOT may be passed in, e.g. RPM_BUILD_ROOT
-.if empty $(INSTROOT)
+.if empty(INSTROOT)
   BIN_D=$(BINDIR)
   INIT_D=$(INITDIR)
   CONF_D=$(CONFDIR)
@@ -36,7 +36,7 @@ CC= gcc -std=gnu99
 OPT_FULL = -O3 -DNDEBUG
 OPT_DEBUG = -g -ggdb
 
-.if empty $(OPT)
+.if empty(OPT)
   OPT=$(OPT_FULL)
 .endif