configure: use pkg-config for postgresql

configure

@@ -9,8 +9,6 @@ cleanup() {
 	rm -rf ${TH_TMPCPROGB}
 	rm -rf ${GCM_TMPCPROGC}
 	rm -rf ${GCM_TMPCPROGB}
-	rm -rf ${PQ_TMPCPROGC}
-	rm -rf ${PQ_TMPCPROGB}
 	rm -rf ${MYSQL_TMPCPROGC}
 	rm -rf ${MYSQL_TMPCPROGB}
 	rm -rf ${MONGO_TMPCPROGC}
@@ -74,38 +72,6 @@ testlibevent2_comp() {
     fi
 }
 
-testlibpq() {
-    if [ -z "${PSQL_CFLAGS}" ] || [ -z "${PSQL_LIBS}" ]; then
-        PSQL_CFLAGS="-I${PREFIX}/pgsql/include -I${PREFIX}/include/pgsql/ -I${PREFIX}/include/postgres/ -I${PREFIX}/postgres/include/ -I${PREFIX}/include/postgresql/ -I${PREFIX}/postgresql/include/"
-        PSQL_CFLAGS="${PSQL_CFLAGS} -I/usr/local/pgsql/include -I/usr/local/include/pgsql/ -I/usr/local/include/postgres/ -I/usr/local/postgres/include/ -I/usr/local/include/postgresql/ -I/usr/local/postgresql/include/"
-        PSQL_CFLAGS="${PSQL_CFLAGS} -I/usr/pgsql/include -I/usr/include/pgsql/ -I/usr/include/postgres/ -I/usr/postgres/include/ -I/usr/include/postgresql/ -I/usr/postgresql/include/"
-        for ilib in ${PREFIX}/pgsql/lib ${PREFIX}/lib/pgsql ${PREFIX}/lib64/pgsql /usr/local/pgsql/lib /usr/local/lib/pgsql /usr/local/lib64/pgsql /usr/pgsql/lib /usr/lib/pgsql /usr/lib64/pgsql ${PREFIX}/postgres/lib ${PREFIX}/lib/postgres ${PREFIX}/lib64/postgres /usr/local/postgres/lib /usr/local/lib/postgres /usr/local/lib64/postgres /usr/postgres/lib /usr/lib/postgres /usr/lib64/postgres ${PREFIX}/postgresql/lib ${PREFIX}/lib/postgresql ${PREFIX}/lib64/postgresql /usr/local/postgresql/lib /usr/local/lib/postgresql /usr/local/lib64/postgresql /usr/postgresql/lib /usr/lib/postgresql /usr/lib64/postgresql
-        do
-	    if [ -d ${ilib} ] ; then
-    	        PSQL_LIBS="${PSQL_LIBS} -L${ilib}"
-	        if ! [ -z "${TURN_ACCEPT_RPATH}" ] ; then
-		    TURN_RPATH="${TURN_RPATH} -Wl,-rpath,${ilib}"
-	        fi
-	    fi
-        done
-        PSQL_LIBS="${OSLIBS} ${PSQL_LIBS} -lpq"
-    fi
-    ${CC} ${PQ_TMPCPROGC} -o ${PQ_TMPCPROGB} ${OSCFLAGS} ${DBCFLAGS} ${PSQL_CFLAGS} ${DBLIBS} ${PSQL_LIBS} ${OSLIBS} 2>>/dev/null 
-    ER=$?
-    if ! [ ${ER} -eq 0 ] ; then
-    	${ECHO_CMD}
-		${ECHO_CMD} "POSTGRESQL DEVELOPMENT LIBRARY (libpq.a) AND/OR HEADER (libpq-fe.h)"
-		${ECHO_CMD} "	ARE NOT INSTALLED PROPERLY ON THIS SYSTEM."
-		${ECHO_CMD} "	THAT'S OK BUT THE TURN SERVER IS BUILDING WITHOUT POSTGRESQL DATABASE SUPPORT."
-		${ECHO_CMD}
-		return 0
-    else
-		DBCFLAGS="${DBCFLAGS} ${PSQL_CFLAGS}"
-		DBLIBS="${DBLIBS} ${PSQL_LIBS}"
-		return 1
-    fi
-}
-
 testlibmysql() {
     if [ -z "${MYSQL_CFLAGS}" ] || [ -z "${MYSQL_LIBS}" ]; then
         MYSQL_CFLAGS="-I${PREFIX}/mysql/include -I${PREFIX}/include/mysql/"
@@ -689,18 +655,6 @@ int main(int argc, char** argv) {
 }
 !
 
-PQ_TMPCPROG=__test__ccomp__libpq__$$
-PQ_TMPCPROGC=${TMPDIR}/${PQ_TMPCPROG}.c
-PQ_TMPCPROGB=${TMPDIR}/${PQ_TMPCPROG}
-
-cat > ${PQ_TMPCPROGC} <<!
-#include <stdlib.h>
-#include <libpq-fe.h>
-int main(int argc, char** argv) {
-    return (argc+(PQprotocolVersion(NULL))+(int)(argv[0][0]));
-}
-!
-
 MYSQL_TMPCPROG=__test__ccomp__libmysql__$$
 MYSQL_TMPCPROGC=${TMPDIR}/${MYSQL_TMPCPROG}.c
 MYSQL_TMPCPROGB=${TMPDIR}/${MYSQL_TMPCPROG}
@@ -1098,16 +1052,14 @@ fi
 ###########################
 
 if [ -z "${TURN_NO_PQ}" ] ; then
-
-	testlibpq
-	ER=$?
-	if ! [ ${ER} -eq 0 ] ; then
-		${ECHO_CMD} "PostgreSQL found."
-	else
-		TURN_NO_PQ="-DTURN_NO_PQ"
-	fi
+    if testpkg_db libpq; then
+        ${ECHO_CMD} "PostgreSQL found."
+    else
+        ${ECHO_CMD} "PostgreSQL not found. Building without PostgreSQL support."
+        TURN_NO_PQ="-DTURN_NO_PQ"
+    fi
 else
-	TURN_NO_PQ="-DTURN_NO_PQ"
+    TURN_NO_PQ="-DTURN_NO_PQ"
 fi
 
 ###########################