diff --git a/MAINTAINERS b/MAINTAINERS
index cad58b948791..8206fc51dbbc 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -408,7 +408,7 @@ M: Paul Durrant <paul.durrant@citrix.com>
 L: xen-devel@lists.xenproject.org
 S: Supported
 F: */xen*
-F: hw/9pfs/xen-9p-backend.c
+F: hw/9pfs/xen-9p*
 F: hw/char/xen_console.c
 F: hw/display/xenfb.c
 F: hw/net/xen_nic.c
@@ -1498,6 +1498,7 @@ virtio-9p
 M: Greg Kurz <groug@kaod.org>
 S: Supported
 F: hw/9pfs/
+X: hw/9pfs/xen-9p*
 F: fsdev/
 F: tests/virtio-9p-test.c
 T: git https://github.com/gkurz/qemu.git 9p-next
diff --git a/Makefile b/Makefile
index cfb18f152544..c62594445d5f 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,9 @@
 # Makefile for QEMU.
 
+ifneq ($(words $(subst :, ,$(CURDIR))), 1)
+  $(error main directory cannot contain spaces nor colons)
+endif
+
 # Always point to the root of the build tree (needs GNU make).
 BUILD_DIR=$(CURDIR)
 
diff --git a/configure b/configure
index 5c7914570e9f..f2cb9f3c66d3 100755
--- a/configure
+++ b/configure
@@ -276,10 +276,15 @@ ld_has() {
     $ld --help 2>/dev/null | grep ".$1" >/dev/null 2>&1
 }
 
-# default parameters
-source_path=$(dirname "$0")
 # make source path absolute
-source_path=$(cd "$source_path"; pwd)
+source_path=$(cd "$(dirname -- "$0")"; pwd)
+
+if printf %s\\n "$source_path" "$PWD" | grep -q "[[:space:]:]";
+then
+  error_exit "main directory cannot contain spaces nor colons"
+fi
+
+# default parameters
 cpu=""
 iasl="iasl"
 interp_prefix="/usr/gnemul/qemu-%M"
@@ -5130,7 +5135,7 @@ fi
 sem_timedwait=no
 cat > $TMPC << EOF
 #include <semaphore.h>
-int main(void) { return sem_timedwait(0, 0); }
+int main(void) { sem_t s; struct timespec t = {0}; return sem_timedwait(&s, &t); }
 EOF
 if compile_prog "" "" ; then
     sem_timedwait=yes