My configure string:

./configure  --prefix=/software/php-4 --with-apxs=/software/apache-1.3/bin/apxs --with-gdbm --with-ldap=/software/openldap-2 --with-pgsql=/software/postgresql-7 --with-config-file-path=/software/php-4/lib

Using OpenLDAP 2.0.7 and PostgreSQL 7.1 on a SuSE 6.4 box.

# ldd libphp4.so 
        libpam.so.0 => /lib/libpam.so.0 (0x40144000)
        libdl.so.2 => /lib/libdl.so.2 (0x4014c000)
        libpq.so.2 => /software/postgresql-7/lib/libpq.so.2 (0x40150000)
        libldap.so.2 => /software/openldap-2/lib/libldap.so.2 (0x4015f000)
        liblber.so.2 => /software/openldap-2/lib/liblber.so.2 (0x40249000)
        libgdbm.so.2 => /usr/lib/libgdbm.so.2 (0x40256000)
        libresolv.so.2 => /lib/libresolv.so.2 (0x4025e000)
        libm.so.6 => /lib/libm.so.6 (0x4026d000)
        libcrypt.so.1 => /lib/libcrypt.so.1 (0x4028a000)
        libnsl.so.1 => /lib/libnsl.so.1 (0x402b7000)
        libc.so.6 => /lib/libc.so.6 (0x402ce000)
        /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x80000000)

Here is an strace of an Apache child that died. I'm using NSS_LDAP and PAM_LDAP.

open("/lib/libpthread.so.0", O_RDONLY)  = 4
fstat(4, {st_mode=S_IFREG|0755, st_size=289663, ...}) = 0
read(4, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\200?\0"..., 4096) = 4096
mmap(NULL, 75832, PROT_READ|PROT_EXEC, MAP_PRIVATE, 4, 0) = 0x405aa000
mprotect(0x405b5000, 30776, PROT_NONE)  = 0
mmap(0x405b5000, 32768, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 4, 0xa000) = 0x405b5000
close(4)                                = 0
mprotect(0x40592000, 90112, PROT_READ|PROT_WRITE) = 0
mprotect(0x40592000, 90112, PROT_READ|PROT_EXEC) = 0
getpid()                                = 15900
getrlimit(RLIMIT_STACK, {rlim_cur=RLIM_INFINITY, rlim_max=RLIM_INFINITY}) = 0
setrlimit(RLIMIT_STACK, {rlim_cur=2040*1024, rlim_max=RLIM_INFINITY}) = 0
uname({sys="Linux", node="oradev", ...}) = 0
rt_sigaction(SIGRT_0, {0x405b1c60, [], 0x4000000}, NULL, 8) = 0
rt_sigaction(SIGRT_1, {0x405b1d00, [], 0x4000000}, NULL, 8) = 0
rt_sigaction(SIGRT_2, {0x405b1e20, [], 0x4000000}, NULL, 8) = 0
rt_sigprocmask(SIG_BLOCK, [RT_0], NULL, 8) = 0
munmap(0x402c8000, 28943)               = 0
geteuid()                               = 0
getpid()                                = 15900
open("/etc/ldap.conf", O_RDONLY)        = 4
fstat(4, {st_mode=S_IFREG|0644, st_size=213, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40015000
read(4, "# $Id$\n\nhost 192.168.0.1\nbase o="..., 4096) = 213
read(4, "", 4096)                       = 0
close(4)                                = 0
munmap(0x40015000, 4096)                = 0
uname({sys="Linux", node="oradev", ...}) = 0
open("/etc/hosts", O_RDONLY)            = 4
fcntl(4, F_GETFD)                       = 0
fcntl(4, F_SETFD, FD_CLOEXEC)           = 0
fstat(4, {st_mode=S_IFREG|0644, st_size=708, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40015000
read(4, "#\n# hosts         This file desc"..., 4096) = 708
close(4)                                = 0
munmap(0x40015000, 4096)                = 0
getrlimit(RLIMIT_NOFILE, {rlim_cur=1024, rlim_max=1024}) = 0
open("/software/openldap-2/etc/openldap/ldap.conf", O_RDONLY) = 4
fstat(4, {st_mode=S_IFREG|0644, st_size=337, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40015000
read(4, "# $OpenLDAP: pkg/ldap/libraries/"..., 4096) = 337
read(4, "", 4096)                       = 0
close(4)                                = 0
munmap(0x40015000, 4096)                = 0
open("/root/ldaprc", O_RDONLY)          = -1 ENOENT (No such file or directory)
open("/root/.ldaprc", O_RDONLY)         = -1 ENOENT (No such file or directory)
open("ldaprc", O_RDONLY)                = -1 ENOENT (No such file or directory)
uname({sys="Linux", node="oradev", ...}) = 0
socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 4
ioctl(4, FIONBIO, [1])                  = 0
connect(4, {sin_family=AF_INET, sin_port=htons(389), sin_addr=inet_addr("192.168.0.1")}}, 16) = -1 EINPROGRESS (Operation now in progress)
select(1024, NULL, [4], NULL, NULL)     = 1 (out [4])
getpeername(4, {sin_family=AF_INET, sin_port=htons(389), sin_addr=inet_addr("192.168.0.1")}}, [16]) = 0
ioctl(4, FIONBIO, [0])                  = 0
brk(0x811e000)                          = 0x811e000
time(NULL)                              = 988912101
write(4, "0\f\2\1\1`\7\2\1\2\4\0\200\0", 14) = 14
select(1024, [4], [], NULL, NULL)       = 1 (in [4])
read(4, "0\f\2\1\1a\7\n\1\0\4\0\4\0", 16384) = 14
time(NULL)                              = 988912101
geteuid()                               = 0
getpid()                                = 15900
rt_sigaction(SIGPIPE, {SIG_IGN}, {SIG_IGN}, 8) = 0
getpeername(135365352, 0xbfffef1c, [1025]) = -1 EBADF (Bad file descriptor)
write(4, "0\5\2\1\2B\0", 7)             = 7
--- SIGSEGV (Segmentation fault) ---
chdir("/software/apache-1.3")           = 0
rt_sigaction(SIGSEGV, {SIG_DFL}, {SIG_DFL}, 8) = 0
getpid()                                = 15900
kill(15900, SIGSEGV)                    = 0
sigreturn()                             = ? (mask now [])
--- SIGSEGV (Segmentation fault) ---