BuildRequires: s/postgresql-devel/libpq-devel/

That's because we moved libpq.so.5 into libpq package.

Related: rhbz#1618698, rhbz#1623764

redland.spec

@@ -19,7 +19,7 @@ BuildRequires:  mariadb-connector-c-devel
 BuildRequires:  mysql-devel
 %endif
 BuildRequires:  perl-interpreter
-BuildRequires:  postgresql-devel
+BuildRequires:  libpq-devel
 BuildRequires:  raptor2-devel 
 BuildRequires:  rasqal-devel >= 0.9.26
 BuildRequires:  sqlite-devel