The ltconfig seems to be somewhat out of date with regards to OpenBSD.  On i386,it is unable to detect shared libraries at runtime when compiled out of the box, and on OpenBSD 2.8 onwards, it should use 'cc -shared' instead of the default.  

Currently, this is what I get when trying to start Apache (with the --with-imap option specified):

[root@brick php4]# apachectl startssl
/usr/libexec/ld.so: Undefined symbol "_mail_string" in httpd:/usr/lib/apache/modules/libphp4.so

OpenBSD includes a version of ltconfig that is up-to-date with respect to these changes, and I merged them in here to enable CVS to compile 'out-of-the-box' on my OpenBSD box.  It should not affect previous OpenBSD revisions.

It has only been tested on i386 OpenBSD, and could really use testing on Sparc/PowerPC.

Here is the patch to ltconfig from latest CVS:

Index: ltconfig
===================================================================
RCS file: /repository/php4/ltconfig,v
retrieving revision 1.20
diff -u -r1.20 ltconfig
--- ltconfig    2000/11/04 02:42:10     1.20
+++ ltconfig    2000/12/05 17:11:47
@@ -1105,6 +1105,9 @@
     with_gnu_ld=no
   fi
   ;;
+openbsd*)
+  with_gnu_ld=no
+  ;;
 
 esac
 
@@ -1402,10 +1405,18 @@
     ;;
 
   openbsd*)
-    archive_cmds='$LD -Bshareable -o $lib $libobjs $deplibs $linkopts'
-    hardcode_libdir_flag_spec='-R$libdir'
     hardcode_direct=yes
     hardcode_shlibpath_var=no
+    case "$host_os" in
+      openbsd2.[01234567])
+       archive_cmds='$LD -Bshareable -o $lib $libobjs $deplibs $linkopts'
+       hardcode_libdir_flag_spec='-R$libdir'
+      ;;
+      *)
+       archive_cmds='$CC -shared $pic_flag -o $lib $libobjs $deplibs $linkopts'
+       hardcode_libdir_flag_spec='${wl}-rpath,$libdir'
+      ;;
+    esac
     ;;
 
   os2*)
@@ -2019,13 +2030,10 @@
 
 openbsd*)
   version_type=sunos
-  if test "$with_gnu_ld" = yes; then
-    need_lib_prefix=no
-    need_version=no
-  fi
   library_names_spec='${libname}${release}.so$versuffix ${libname}.so$versuffix'
   finish_cmds='PATH="\$PATH:/sbin" ldconfig -m $libdir'
   shlibpath_var=LD_LIBRARY_PATH
+  deplibs_check_method='pass_all'
   ;;
 
 os2*)