diff -ru a/nspr/configure b/nspr/configure
--- a/a/nspr/configure	2019-01-26 12:23:06.589389910 +0100
+++ b/b/nspr/configure	2019-01-26 12:26:56.566222293 +0100
@@ -7127,7 +7127,7 @@
 
         # Determine compiler version
 
-        _MSVC_VER_FILTER='s|.* \([0-9]\+\.[0-9]\+\.[0-9]\+\(\.[0-9]\+\)\?\).*|\1|p'
+        _MSVC_VER_FILTER='s|.*[^!-~]\([0-9]\+\.[0-9]\+\.[0-9]\+\(\.[0-9]\+\)\?\).*|\1|p'
 
         CC_VERSION=`${CC} -v 2>&1 | sed -ne "$_MSVC_VER_FILTER"`
         if test -z "$CC_VERSION"; then