probably uninteresting, xmlrpc build error libiconv related

Trying to build 4.2.0 RC1 on a RedHat 6.2 box with - automake (GNU automake) 1.5 - Autoconf version 2.13 - ltmain.sh (GNU libtool) 1.4.2 - libiconv.so.2.0.4 all compiled from sources with the following configuration: ./configure --with-apxs=/usr/local/apache/bin/apxs --with-trans-sid --with-m ysql=/usr/local/mysql --with-interbase=/opt/interbase --with-xmlrpc I get the following error: make[2]: Entering directory `/usr/src/php-4.2.0RC1/sapi/cli' /bin/sh /usr/src/php-4.2.0RC1/libtool --silent --mode=link gcc -I. -I/usr/src/php-4.2.0RC1/sapi/cli -I/usr/src/php-4.2.0RC1/main -I/usr /src/php-4.2.0RC1 -I/usr/local/apache/include -I/usr/src/php-4.2.0RC1/Zend - I/opt/interbase/include -I/usr/local/mysql/include/mysql -I/usr/src/php-4.2. 0RC1/ext/xml/expat -I/usr/local/include -I/usr/src/php-4.2.0RC1/ext/xmlrpc/l ibxmlrpc -DLINUX=22 -DUSE_HSREGEX -DUSE_EXPAT -I/usr/src/php-4.2.0RC1/TSRM -g -O2 -o php -export-dynamic libphp4cli.la ./.libs/libphp4cli.a(encodings.lo): In function `convert': /usr/src/php-4.2.0RC1/ext/xmlrpc/libxmlrpc/encodings.c:47: undefined reference to `libiconv_open' /usr/src/php-4.2.0RC1/ext/xmlrpc/libxmlrpc/encodings.c:58: undefined reference to `libiconv' /usr/src/php-4.2.0RC1/ext/xmlrpc/libxmlrpc/encodings.c:78: undefined reference to `libiconv_close' collect2: ld returned 1 exit status make[2]: *** [php] Error 1 make[2]: Leaving directory `/usr/src/php-4.2.0RC1/sapi/cli' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory `/usr/src/php-4.2.0RC1/sapi/cli' make: *** [all-recursive] Error 1 I never successfully managed to compile the xmlrpc extension in the past few weeks, so maybe I'm doing something wrong in the configure process. Ludo