When configuring --with-iconv or --with-xslt-sablot the following error is resieved:
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checking for iconv... no
checking for libiconv... no
checking for libiconv in -liconv... no
checking for iconv in -liconv... no
configure: error: iconv not found, in order to build sablotron you need the iconv library
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config.log shows this:

configure:66574: checking for libiconv
configure:66602: gcc -o conftest -g -O2   -Wl,-rpath,/lib -L/lib conftest.c -lexpat -lmm -lcrypt -lgd -lexslt -lxsltbreakpoint -lxml
2 -lxslt -lz -lxml2 -lcurl -ldl -lcrypto -lssl -lcurl -lbz2 -lz -lcrypt -lssl -lcrypto -lresolv -lm -ldl -lnsl  -lresolv -lcrypt -lg
ssapi_krb5 -lkrb5 -lk5crypto -lcom_err 1>&5
/usr/bin/ld: cannot find -lgssapi_krb5
collect2: ld returned 1 exit status
configure: failed program was:
#line 66579 "configure"
#include "confdefs.h"
/* System header to define __stub macros and hopefully few prototypes,
    which can conflict with char libiconv(); below.  */
#include <assert.h>
/* Override any gcc2 internal prototype to avoid an error.  */
/* We use char because int might match the return type of a gcc2
    builtin and then its argument prototype would still apply.  */
char libiconv();

int main() {

/* The GNU C library defines this for functions which it implements
    to always fail with ENOSYS.  Some functions are actually named
    something starting with __ and the normal name is an alias.  */
#if defined (__stub_libiconv) || defined (__stub___libiconv)
choke me
#else
libiconv();
#endif

; return 0; }