$NetBSD$

Ugly workaround - seems to build on SunOS at least just fine.
--- configure.orig	2013-01-10 12:37:16.333637074 +0000
+++ configure
@@ -2707,9 +2707,6 @@ $as_echo "Darwin" >&6; }
        { $as_echo "$as_me:${as_lineno-$LINENO}: result: Windows" >&5
 $as_echo "Windows" >&6; }
        ;;
-       *)
-       as_fn_error $? "Host OS not supported." "$LINENO" 5
-       ;;
      esac
 
 if test "${CXX}x" = "x" -a "${CC}x" = "x" -a "${host_os}" = "windows"; then
@@ -11586,9 +11583,9 @@ _ACEOF
 
 
 ac_gecode_library_architecture=-${VERSION_DASHES}${ac_gecode_library_architecture}
-if test   "$ac_gecode_compiler_vendor" == "microsoft" \
-       -o \( "$ac_gecode_compiler_vendor" == "intel" \
-            -a "$host_os" == "windows" \) ; then
+if test   "$ac_gecode_compiler_vendor" = "microsoft" \
+       -o \( "$ac_gecode_compiler_vendor" = "intel" \
+            -a "$host_os" = "windows" \) ; then
   DLL_ARCH=${ac_gecode_library_architecture}
 
 else
