### Description

Cannot build postgres module on openSUSE Tumbleweed

### Troubleshooting

#### Reproduction

Package kamailio on openSUSE Tumbleweed.

#### Debugging Data

N/A

#### Log Messages

``` [ 434s] xsubpp -typemap `perl -MConfig -e 'print $Config{installprivlib}'`/ExtUtils/typemap -typemap typemap kamailioxs.xs > kamailioxs.c [ 434s] CC (gcc) [M app_perl.so] kamailioxs.o [ 435s] LD (gcc) [M app_perl.so] app_perl.so [ 436s] CC (gcc) [M db_perlvdb.so] perlvdbfunc.o [ 437s] CC (gcc) [M db_perlvdb.so] perlvdb_oohelpers.o [ 437s] CC (gcc) [M db_perlvdb.so] perlvdb_conv.o [ 438s] CC (gcc) [M db_perlvdb.so] db_perlvdb.o [ 439s] make[3]: 'libsrdb1.so.1.0' is up to date. [ 439s] LD (gcc) [M db_perlvdb.so] db_perlvdb.so [ 439s] which: no pg_config in (/usr/local/bin:/usr/bin:/bin:/usr/lib/mit/bin:/usr/lib/mit/sbin) [ 439s] which: no pg_config in (/usr/local/bin:/usr/bin:/bin:/usr/lib/mit/bin:/usr/lib/mit/sbin) [ 439s] CC (gcc) [M db_postgres.so] pg_uri.o [ 439s] CC (gcc) [M db_postgres.so] pg_sql.o [ 439s] CC (gcc) [M db_postgres.so] pg_res.o [ 439s] In file included from pg_res.c:33: [ 439s] pg_res.h:40:10: fatal error: libpq-fe.h: No such file or directory [ 439s] #include <libpq-fe.h> [ 439s] ^~~~~~~~~~~~ [ 439s] compilation terminated. [ 439s] make[2]: *** [../../Makefile.rules:100: pg_res.o] Error 1 [ 439s] make[1]: *** [Makefile:511: modules] Error 1 [ 439s] make[1]: Leaving directory '/home/abuild/rpmbuild/BUILD/kamailio-5.3.0-dev4/src' [ 439s] make: *** [Makefile:30: every-module] Error 2 [ 439s] error: Bad exit status from /var/tmp/rpm-tmp.dwfwP1 (%build) [ 439s] [ 439s] [ 439s] RPM build errors: [ 439s] bogus date in %changelog: Tue Feb 21 2019 Sergey Safarov s.safarov@gmail.com 5.3.0-0 [ 439s] Bad exit status from /var/tmp/rpm-tmp.dwfwP1 (%build) [ 439s] [ 439s] build80 failed "build kamailio.spec" at Sat Mar 30 09:44:29 UTC 2019. [ 439s] ```

#### SIP Traffic

N/A

### Possible Solutions

Add ability to use pkgconfig file from Makefile

``` d90393c7d32a:/ # cat /usr/lib64/pkgconfig/libpq.pc Name: libpq Description: PostgreSQL libpq library Url: http://www.postgresql.org/ Version: 11.2 Requires: Requires.private: Cflags: -I/usr/include/pgsql Libs: -lpq Libs.private: -lssl -lcrypto -lgssapi_krb5 -lcrypt -lldap_r ```

### Additional Information

Current master

* **Operating System**:

``` d90393c7d32a:/ # cat /etc/os-release NAME="openSUSE Tumbleweed" # VERSION="20190327" ID="opensuse-tumbleweed" ID_LIKE="opensuse suse" VERSION_ID="20190327" PRETTY_NAME="openSUSE Tumbleweed" ANSI_COLOR="0;32" CPE_NAME="cpe:/o:opensuse:tumbleweed:20190327" BUG_REPORT_URL="https://bugs.opensuse.org" HOME_URL="https://www.opensuse.org/" ```