Fix for NetBSD. Submitted by gduzan@acm.org.

configure.in

@@ -301,11 +301,15 @@ alpha*-*-osf*)
 *-netbsd*)
     DLL_SUFFIX="so.1.0"
     DSO_CFLAGS='-fPIC'
-    DSO_LDOPTS='-Wl,-shared -Wl,-h -Wl,$(@:$(OBJDIR)/%.$(DLL_SUFFIX)=%.$(DLL_SUFFIX))'
-    MKSHLIB='$(CXX) $(DSO_LDOPTS)'
-dnl What is this supposed to tell us...?  I don't see the point (at least on 1.3H for alpha).
+    DSO_LDOPTS='-shared -h $(@:$(OBJDIR)/%.$(DLL_SUFFIX)=%.$(DLL_SUFFIX))'
+    MKSHLIB='$(LD) $(DSO_LDOPTS)'
+    MKSHLIB_FORCE_ALL='--whole-archive'
+    MKSHLIB_UNFORCE_ALL='--no-whole-archive'
+    CFLAGS="$CFLAGS -Dunix"
+    CXXFLAGS="$CXXFLAGS -Dunix"
+dnl Test for a.out platform and handle C++ libraries correctly
     if $CC -E - -dM </dev/null | grep -v __ELF__ >/dev/null; then
-	DSO_LDOPTS="-Bshareable $DSO_LDOPTS"
+	DSO_LDOPTS="-shared /usr/lib/c++rt0.o"
     fi
     if test "$LIBRUNPATH"; then
 	DSO_LDOPTS="-R$LIBRUNPATH $DSO_LDOPTS"