I tried to install Apache 1.3.20 with PHP 4.0.6. Everything compiled without complaining. But if I try to start the httpd the following message occurs:
"Cannot load /usr/local/apache/libexec/libphp4.so into server: /usr/local/apache/libexec/libphp4.so: undefined symbol: sasl_set_alloc".

ldd libphp4.so seems to be ok:
libdl.so.2 => /lib/libdl.so.2 (0x40172000)
libz.so.1 => /lib/libz.so.1 (0x40176000)
libjpeg.so.62 => /usr/lib/libjpeg.so.62 (0x40186000)
libpng.so.2 => /usr/lib/libpng.so.2 (0x401a5000)
libtiff.so.3 => /usr/lib/libtiff.so.3 (0x401d7000)
libpdf.so.0 => /usr/lib/libpdf.so.0 (0x4021b000)
libcrypt.so.1 => /lib/libcrypt.so.1 (0x40246000)
libresolv.so.2 => /lib/libresolv.so.2 (0x40274000)
libm.so.6 => /lib/libm.so.6 (0x40286000)
libnsl.so.1 => /lib/libnsl.so.1 (0x402a5000)
libc.so.6 => /lib/libc.so.6 (0x402bc000)
/lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x2aaaa000)

PHP was configured with:
./configure --with-apxs=/usr/local/apache/bin/apxs --with-ldap --with-mysql --enable-track-vars --enable-trans-sid --with-pdflib

Apache was configured with:
./configure --prefix=/usr/local/apache --enable-module=most --enable-shared=max

Versions of other related packages:
openssl-0.9.6a
openldap2-devel-2.0.7

Any ideas?