My exact problem is described here, but the thread never explains how to solve the problem, 

"here" = http://lists.kamailio.org/pipermail/sr-users/2013-January/076554.html

Description of the issue: 
1. Installing Kamailio 4.1 (latest download) on a 64 bit Linux Mint version 16 Petra
2. The system compiles cleanly. I have included MAKE and Make Install info below
3.  ims_registrar_pcscf.so will not load
4.  ims_qos.so will not load
5. As an FYI, cdp.so successfully loads. I mention this because cdp.so uses semaphore but does not have the sem_post problem. I compared cdp.so with ims_registrar.pcscf.soMakefiles to see if there was something obvious, but no luck.
6. As an FYI, I get the exact same error from a debian apt-get install, so using the canned Debian solution won't work for me either.
7. The config file I used is the one included with the system which I completed with some info just for testing. I have attached it purely as FYI but I don't think that is the issue.

Parts of the syslog messages relevant for issue
Jan 26 22:03:21 PC03 kamailio: ERROR: <core> [sr_module.c:599]: load_module(): ERROR: load_module: could not open module </lib64/kamailio/modules/ims_qos.so>: /lib64/kamailio/modules/ims_qos.so: undefined symbol: sem_post

Jan 26 22:03:21 PC03 kamailio: ERROR: <core> [sr_module.c:599]: load_module(): ERROR: load_module: could not open module </lib64/kamailio/modules/ims_registrar_pcscf.so>: /lib64/kamailio/modules/ims_registrar_pcscf.soundefined symbol: sem_post


Relevent section of MAKE
CC (gcc) [M ims_qos.so] cdpeventprocessor.o
CC (gcc) [M ims_qos.so] mod.o
CC (gcc) [M ims_qos.so] rx_aar.o
CC (gcc) [M ims_qos.so] rx_asr.o
CC (gcc) [M ims_qos.so] rx_authdata.o
CC (gcc) [M ims_qos.so] rx_avp.o
CC (gcc) [M ims_qos.so] rx_str.o
CC (gcc) [M ims_qos.so] stats.o
make[2]: `libkcore.so.1.0' is up to date.
make[2]: `libkamailio_ims.so.0.1' is up to date.
LD (gcc) [M ims_qos.so] ims_qos.so

CC (gcc) [M ims_registrar_pcscf.so] async_reginfo.o
CC (gcc) [M ims_registrar_pcscf.so] reg_mod.o
CC (gcc) [M ims_registrar_pcscf.so] save.o
CC (gcc) [M ims_registrar_pcscf.so] service_routes.o
CC (gcc) [M ims_registrar_pcscf.so] ul_callback.o
make[2]: `libkcore.so.1.0' is up to date.
make[2]: `libkamailio_ims.so.0.1' is up to date.
LD (gcc) [M ims_registrar_pcscf.so] ims_registrar_pcscf.so
CC (gcc) [M ims_registrar_scscf.so] api.o
CC (gcc) [M ims_registrar_scscf.so] common.o
CC (gcc) [M ims_registrar_scscf.so] config.o
CC (gcc) [M ims_registrar_scscf.so] cxdx_avp.o
CC (gcc) [M ims_registrar_scscf.so] cxdx_callbacks.o
CC (gcc) [M ims_registrar_scscf.so] cxdx_sar.o
CC (gcc) [M ims_registrar_scscf.so] lookup.o
CC (gcc) [M ims_registrar_scscf.so] path.o
CC (gcc) [M ims_registrar_scscf.so] registrar_notify.o
CC (gcc) [M ims_registrar_scscf.so] reg_mod.o
CC (gcc) [M ims_registrar_scscf.so] regpv.o
CC (gcc) [M ims_registrar_scscf.so] regtime.o
CC (gcc) [M ims_registrar_scscf.so] reply.o
CC (gcc) [M ims_registrar_scscf.so] rerrno.o
CC (gcc) [M ims_registrar_scscf.so] save.o
CC (gcc) [M ims_registrar_scscf.so] server_assignment.o
CC (gcc) [M ims_registrar_scscf.so] sip_msg.o
CC (gcc) [M ims_registrar_scscf.so] stats.o
CC (gcc) [M ims_registrar_scscf.so] userdata_parser.o
CC (gcc) [M ims_registrar_scscf.so] usrloc_cb.o

----------------------------------------------------------------------------------------------------
Make Install
LD (gcc) [M ims_icscf.so] ims_icscf.so
make[2]: Nothing to be done for `install-if-newer'.
make[2]: Nothing to be done for `install-if-newer'.
make[2]: Nothing to be done for `install-if-newer'.
touch           //lib64/kamailio/modules/ims_icscf.so
install -m 755  ims_icscf.so  //lib64/kamailio/modules
make[2]: `libkcore.so.1.0' is up to date.
make[2]: `libkamailio_ims.so.0.1' is up to date.
LD (gcc) [M ims_qos.so] ims_qos.so
make[2]: Nothing to be done for `install-if-newer'.
make[2]: Nothing to be done for `install-if-newer'.
touch           //lib64/kamailio/modules/ims_qos.so
install -m 755  ims_qos.so  //lib64/kamailio/modules
make[2]: `libkcore.so.1.0' is up to date.
make[2]: `libkamailio_ims.so.0.1' is up to date.
LD (gcc) [M ims_registrar_pcscf.so] ims_registrar_pcscf.so
make[2]: Nothing to be done for `install-if-newer'.
make[2]: Nothing to be done for `install-if-newer'.
touch           //lib64/kamailio/modules/ims_registrar_pcscf.so
install -m 755  ims_registrar_pcscf.so  //lib64/kamailio/modules