Hi, I am having trouble enabling pgsql support with the configure script and I will almost (boldly!) claim there might be a problem we the configure script. Autoconf and friends is however close to black magic and voodoo so I will try to assert my viewpoint and hopefully someone can point out my level of cluelessness :-) I am able to compile and run Freeswitch 1.2.8 (without core-pgsql), PostgreSQL 9.2.4 and OpenResty 1.2.8.5 (with libpq!). Openresty was configured with: ./configure --with-luajit --with-http_iconv_module --with-http_postgres_module --with-libpq=/usr/pgsql-9.2 Hence I know that I have a recent and working libpq. From previous mails on this list I can see that is the typical response to this issue is to install postgresql92-devel which I have already done. However freeswitch configure fails: $ ./configure --enable-core-pgsql-support <snip> checking for odbc header in /usr/include... found checking for SQLDisconnect in -lodbc... yes checking whether to include odbc... yes checking for SQLDisconnect in -lodbc... (cached) yes checking for pg_config... /usr/pgsql-9.2/bin/pg_config checking for PostgreSQL libraries... checking for PQgetvalue in -lpq... no configure: error: no usable libpq; please install PostgreSQL devel package or equivalent The part of configure which fails is: { $as_echo "$as_me:$LINENO: checking for PQgetvalue in -lpq" >&5 $as_echo_n "checking for PQgetvalue in -lpq... " >&6; } if test "${ac_cv_lib_pq_PQgetvalue+set}" = set; then $as_echo_n "(cached) " >&6 else ac_check_lib_save_LIBS=$LIBS LIBS="-lpq $LIBS" I do simply not understand what "${ac_cv_lib_pq_PQgetvalue+set}" actually is doing and it becomes a dark art for me. If I remove the "if" clause I assume things would simply work (as LIBS should be correct)! My initial thought was to try to make an addition to configure to support the following options: --with-pgsql-lib=dir --with-pqsql-include=dir My OCD does however not like that I do not understand the test performed today. To blindly add those options would be too hackish (and stoopid). Can anyone explain what happens in the configure script? I would rather spend some time making sure configure works perfectly rather than tweaking my environment to match the expectations of the script. Kind Regards, Claus Andersen Additional info: Freeswitch 1.2.8 with PostgreSQL 9.2.4 uname -m = x86_64 uname -r = 2.6.32-358.6.1.el6.x86_64 uname -s = Linux uname -v = #1 SMP Tue Apr 23 19:29:00 UTC 2013 $ grep PQgetvalue /usr/pgsql-9.2/include/libpq-fe.h extern char *PQgetvalue(const PGresult *res, int tup_num, int field_num); $ pg_config (excerpt) INCLUDEDIR = /usr/pgsql-9.2/include LIBDIR = /usr/pgsql-9.2/lib LDFLAGS = -L/usr/lib64 -Wl,--as-needed LIBS = -lpgport -lxslt -lxml2 -lpam -lssl -lcrypto -lgssapi_krb5 -lz -lreadline -lcrypt -ldl -lm VERSION = PostgreSQL 9.2.4 $ tail config.log #define HAVE_ODBC 1 #define HAVE_LIBODBC 1 #define SWITCH_HAVE_PGSQL 1 #define POSTGRESQL_VERSION "9.2.4" #define POSTGRESQL_MAJOR_VERSION 9 #define POSTGRESQL_MINOR_VERSION 2 #define POSTGRESQL_PATCH_VERSION 4 configure: exit 1 $ rpm -ql postgresql92-devel | grep libpq /usr/pgsql-9.2/include/internal/libpq /usr/pgsql-9.2/include/internal/libpq-int.h /usr/pgsql-9.2/include/internal/libpq/pqcomm.h /usr/pgsql-9.2/include/libpq /usr/pgsql-9.2/include/libpq-events.h /usr/pgsql-9.2/include/libpq-fe.h /usr/pgsql-9.2/include/libpq/libpq-fs.h /usr/pgsql-9.2/include/server/libpq /usr/pgsql-9.2/include/server/libpq/auth.h /usr/pgsql-9.2/include/server/libpq/be-fsstubs.h /usr/pgsql-9.2/include/server/libpq/crypt.h /usr/pgsql-9.2/include/server/libpq/hba.h /usr/pgsql-9.2/include/server/libpq/ip.h /usr/pgsql-9.2/include/server/libpq/libpq-be.h /usr/pgsql-9.2/include/server/libpq/libpq-fs.h /usr/pgsql-9.2/include/server/libpq/libpq.h /usr/pgsql-9.2/include/server/libpq/md5.h /usr/pgsql-9.2/include/server/libpq/pqcomm.h /usr/pgsql-9.2/include/server/libpq/pqformat.h /usr/pgsql-9.2/include/server/libpq/pqsignal.h /usr/pgsql-9.2/lib/libpq.a /usr/pgsql-9.2/lib/libpq.so