gd2 configuration fails on Leopard

[Michael J. I. Jackson]

On a fresh Leopard install, gd2 is failing to configure properly. I  
encountered the error while trying to install the php5 port. Here's  
the output:

$ sudo port install gd2
--->  Fetching gd2
--->  Verifying checksum(s) for gd2
--->  Extracting gd2
--->  Applying patches to gd2
--->  Configuring gd2
Error: Target org.macports.configure returned: shell command "cd /opt/ 
local/var/macports/build/ 
_opt_local_var_macports_sources_rsync 
.macports.org_release_ports_graphics_gd2/work/gd-2.0.35 && autoreconf"  
returned error 1
Command output: configure.ac:46: warning:  
AC_CACHE_VAL(lt_prog_compiler_pic_works, ...): suspicious cache-id,  
must contain _cv_ to be cached
../../lib/autoconf/general.m4:1973: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:1993: AC_CACHE_CHECK is expanded from...
aclocal.m4:626: AC_LIBTOOL_COMPILER_OPTION is expanded from...
aclocal.m4:4814: AC_LIBTOOL_PROG_COMPILER_PIC is expanded from...
aclocal.m4:2662: _LT_AC_LANG_C_CONFIG is expanded from...
aclocal.m4:2661: AC_LIBTOOL_LANG_C_CONFIG is expanded from...
aclocal.m4:91: AC_LIBTOOL_SETUP is expanded from...
aclocal.m4:71: _AC_PROG_LIBTOOL is expanded from...
aclocal.m4:36: AC_PROG_LIBTOOL is expanded from...
configure.ac:46: the top level
configure.ac:46: warning:  
AC_CACHE_VAL(lt_prog_compiler_static_works, ...): suspicious cache-id,  
must contain _cv_ to be cached
aclocal.m4:671: AC_LIBTOOL_LINKER_OPTION is expanded from...
configure.ac:46: warning:  
AC_CACHE_VAL(lt_prog_compiler_pic_works_CXX, ...): suspicious cache- 
id, must contain _cv_ to be cached
aclocal.m4:2739: _LT_AC_LANG_CXX_CONFIG is expanded from...
aclocal.m4:2738: AC_LIBTOOL_LANG_CXX_CONFIG is expanded from...
aclocal.m4:1798: _LT_AC_TAGCONFIG is expanded from...
configure.ac:46: warning:  
AC_CACHE_VAL(lt_prog_compiler_static_works_CXX, ...): suspicious cache- 
id, must contain _cv_ to be cached
configure.ac:46: warning:  
AC_CACHE_VAL(lt_prog_compiler_pic_works_F77, ...): suspicious cache- 
id, must contain _cv_ to be cached
aclocal.m4:3902: _LT_AC_LANG_F77_CONFIG is expanded from...
aclocal.m4:3901: AC_LIBTOOL_LANG_F77_CONFIG is expanded from...
configure.ac:46: warning:  
AC_CACHE_VAL(lt_prog_compiler_static_works_F77, ...): suspicious cache- 
id, must contain _cv_ to be cached
configure.ac:46: warning:  
AC_CACHE_VAL(lt_prog_compiler_pic_works_GCJ, ...): suspicious cache- 
id, must contain _cv_ to be cached
aclocal.m4:4004: _LT_AC_LANG_GCJ_CONFIG is expanded from...
aclocal.m4:4003: AC_LIBTOOL_LANG_GCJ_CONFIG is expanded from...
configure.ac:46: warning:  
AC_CACHE_VAL(lt_prog_compiler_static_works_GCJ, ...): suspicious cache- 
id, must contain _cv_ to be cached
configure.ac:64: error: possibly undefined macro: AM_ICONV
       If this token and others are legitimate, please use  
m4_pattern_allow.
       See the Autoconf documentation.
autoreconf: /opt/local/bin/autoconf failed with exit status: 1

Error: Status 1 encountered during processing.


Any help would be greatly appreciated!