Trying to install psqlodbc-08.03.0300 on Mac gets me this while I configure:
client-6X-XXX-17-X14:~ brent1a$ cd /psqlodbc-08.03.0300
client-6X-XXX-17-X14:psqlodbc-08.03.0300 brent1a$ sudo ./configure
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking whether to enable maintainer-specific portions of Makefiles... no
checking for pg_config... no
configure: error: pg_config not found (set PG_CONFIG environment variable)
client-6X-XXX-17-X14:psqlodbc-08.03.0300 brent1a$