diff --git a/configure.ac b/configure.ac
index 9c35926..027805f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -91,13 +91,18 @@ fi
 ])
 
 if test $backend = freebsd; then
-AC_SUBST(CPPFLAGS, "$CPPFLAGS -I/usr/local/include/libepoll-shim")
-AC_SUBST(LDFLAGS, "$LDFLAGS -L/usr/local/lib")
+AC_SUBST(CPPFLAGS, "$CPPFLAGS -I${prefix}/include/libepoll-shim")
+AC_SUBST(LDFLAGS, "$LDFLAGS -L${prefix}/lib")
 AC_CHECK_HEADERS([sys/epoll.h],[],[AC_MSG_ERROR([Missing libepoll-shim])])
 AC_CHECK_LIB(epoll-shim, epoll_create1)
 fi
 AM_CONDITIONAL([OS_FREEBSD], [test "x$backend" = "xfreebsd"])
 
+if test "x$prefix" = "xNONE" ; then
+  prefix=""
+fi
+AC_SUBST(CPPFLAGS, "$CPPFLAGS -DDEFAULT_RSHIM_CONFIG_FILE='\"${prefix}/etc/rshim.conf\"'")
+
 AC_CHECK_LIB(pthread, pthread_create)
 
 AC_OUTPUT
diff --git a/src/rshim.c b/src/rshim.c
index 1030692..cfd9122 100644
--- a/src/rshim.c
+++ b/src/rshim.c
@@ -178,7 +178,7 @@ int rshim_static_index = -1;
 char *rshim_static_dev_name;
 
 /* Default configuration file. */
-char *rshim_cfg_file = "/etc/rshim.conf";
+const char *rshim_cfg_file = DEFAULT_RSHIM_CONFIG_FILE;
 static int rshim_display_level = 0;
 static int rshim_boot_timeout = 100;
 int rshim_drop_mode = -1;