how to build extensions when not on 9.3?

I ran into a problem trying to build pg_repack via the pgxn install tool on Ubuntu 14.04 with Postgresql 9.2 installed
fromapt.postgresql.org. 

It seems that postgresql-server-dev-9.2 drags libpq-dev-9.3 along with it and the subsequent compiles fail.

Couldn't find any 9.2 libpq-dev versions.

Found this old thread for 12.04 and 9.1 without a resolution:

http://www.postgresql.org/message-id/53989C91.6050403@pinpointresearch.com

ri  libpq-dev                           9.3.4-1.pgdg14.04+1           amd64        header files for libpq5 (PostgreSQL
library)
ri  libpq5                              9.3.4-1.pgdg14.04+1           amd64        PostgreSQL C client library
ii  pgdg-keyring                        2013.2                        all          keyring for apt.postgresql.org
ii  postgresql-9.2                      9.2.8-1.pgdg14.04+1           amd64        object-relational SQL database,
version9.2 server 
ii  postgresql-client-9.2               9.2.8-1.pgdg14.04+1           amd64        front-end programs for PostgreSQL
9.2
ii  postgresql-client-common            154.pgdg14.04+1               all          manager for multiple PostgreSQL
clientversions 
ii  postgresql-common                   154.pgdg14.04+1               all          PostgreSQL database-cluster manager
ii  postgresql-contrib-9.2              9.2.8-1.pgdg14.04+1           amd64        additional facilities for PostgreSQL
ii  postgresql-server-dev-9.2           9.2.8-1.pgdg14.04+1           amd64        development files for PostgreSQL 9.2
server-sideprogramming 

jfrost@db3.production:~$ pgxn install pg_repack --sudo
INFO: best version: pg_repack 1.2.1
INFO: saving /tmp/tmpz6wkuQ/pg_repack-1.2.1.zip
INFO: unpacking: /tmp/tmpz6wkuQ/pg_repack-1.2.1.zip
INFO: building extension
make[1]: Entering directory `/tmp/tmpz6wkuQ/pg_repack-1.2.1/bin'
gcc -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -fPIC -pie
-I/usr/include/mit-krb5-DLINUX_OOM_ADJ=0 -fno-omit-frame-pointer -Wall -Wmissing-prototypes -Wpointer-arith
-Wdeclaration-after-statement-Wendif-labels -Wmissing-format-attribute -Wformat-security -fno-strict-aliasing -fwrapv
-fexcess-precision=standard-g -I/usr/include/postgresql -DREPACK_VERSION=1.2.1 -I. -I./
-I/usr/include/postgresql/9.2/server-I/usr/include/postgresql/internal -D_FORTIFY_SOURCE=2 -D_GNU_SOURCE
-I/usr/include/libxml2 -I/usr/include/tcl8.6  -c -o pg_repack.o pg_repack.c 
In file included from pgut/pgut.h:21:0,
                 from pgut/pgut-fe.h:13,
                 from pg_repack.c:25:
/usr/include/postgresql/libpq-fe.h:547:1: error: unknown type name ‘pg_int64’
 extern pg_int64 lo_lseek64(PGconn *conn, int fd, pg_int64 offset, int whence);
 ^
/usr/include/postgresql/libpq-fe.h:547:50: error: unknown type name ‘pg_int64’
 extern pg_int64 lo_lseek64(PGconn *conn, int fd, pg_int64 offset, int whence);
                                                  ^
/usr/include/postgresql/libpq-fe.h:551:1: error: unknown type name ‘pg_int64’
 extern pg_int64 lo_tell64(PGconn *conn, int fd);
 ^
/usr/include/postgresql/libpq-fe.h:553:48: error: unknown type name ‘pg_int64’
 extern int lo_truncate64(PGconn *conn, int fd, pg_int64 len);
                                                ^
make[1]: *** [pg_repack.o] Error 1
make[1]: Leaving directory `/tmp/tmpz6wkuQ/pg_repack-1.2.1/bin'
make: *** [all] Error 2
ERROR: command returned 2: make PG_CONFIG=/usr/bin/pg_config all

Verified that's the correct pg_config:

jfrost@db3.production:~$ /usr/bin/pg_config
BINDIR = /usr/lib/postgresql/9.2/bin
DOCDIR = /usr/share/doc/postgresql-doc-9.2
HTMLDIR = /usr/share/doc/postgresql-doc-9.2
INCLUDEDIR = /usr/include/postgresql
PKGINCLUDEDIR = /usr/include/postgresql
INCLUDEDIR-SERVER = /usr/include/postgresql/9.2/server
LIBDIR = /usr/lib
PKGLIBDIR = /usr/lib/postgresql/9.2/lib
LOCALEDIR = /usr/share/locale
MANDIR = /usr/share/postgresql/9.2/man
SHAREDIR = /usr/share/postgresql/9.2
SYSCONFDIR = /etc/postgresql-common
PGXS = /usr/lib/postgresql/9.2/lib/pgxs/src/makefiles/pgxs.mk
CONFIGURE = '--with-tcl' '--with-perl' '--with-python' '--with-pam' '--with-krb5' '--with-gssapi' '--with-openssl'
'--with-libxml''--with-libxslt' '--with-ldap' '--with-tclconfig=/usr/lib/x86_64-linux-gnu/tcl8.6'
'--with-includes=/usr/include/tcl8.6''PYTHON=/usr/bin/python' '--mandir=/usr/share/postgresql/9.2/man'
'--docdir=/usr/share/doc/postgresql-doc-9.2''--sysconfdir=/etc/postgresql-common' '--datarootdir=/usr/share/'
'--datadir=/usr/share/postgresql/9.2''--bindir=/usr/lib/postgresql/9.2/bin' '--libdir=/usr/lib/'
'--libexecdir=/usr/lib/postgresql/''--includedir=/usr/include/postgresql/' '--enable-nls' '--enable-integer-datetimes'
'--enable-thread-safety''--enable-debug' '--disable-rpath' '--with-ossp-uuid' '--with-gnu-ld' '--with-pgport=5432'
'--with-system-tzdata=/usr/share/zoneinfo''CFLAGS=-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat
-Werror=format-security-fPIC -pie -I/usr/include/mit-krb5 -DLINUX_OOM_ADJ=0 -fno-omit-frame-pointer'
'LDFLAGS=-Wl,-Bsymbolic-functions-Wl,-z,relro -Wl,-z,now -Wl,--as-needed -L/usr/lib/mit-krb5
-L/usr/lib/x86_64-linux-gnu/mit-krb5''CPPFLAGS=-D_FORTIFY_SOURCE=2' 
CC = gcc
CPPFLAGS = -D_FORTIFY_SOURCE=2 -D_GNU_SOURCE -I/usr/include/libxml2 -I/usr/include/tcl8.6
CFLAGS = -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -fPIC -pie
-I/usr/include/mit-krb5-DLINUX_OOM_ADJ=0 -fno-omit-frame-pointer -Wall -Wmissing-prototypes -Wpointer-arith
-Wdeclaration-after-statement-Wendif-labels -Wmissing-format-attribute -Wformat-security -fno-strict-aliasing -fwrapv
-fexcess-precision=standard-g 
CFLAGS_SL = -fpic
LDFLAGS = -Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-z,now -Wl,--as-needed -L/usr/lib/mit-krb5
-L/usr/lib/x86_64-linux-gnu/mit-krb5-Wl,--as-needed 
LDFLAGS_EX =
LDFLAGS_SL =
LIBS = -lpgport -lxslt -lxml2 -lpam -lssl -lcrypto -lkrb5 -lcom_err -lgssapi_krb5 -lz -ledit -lcrypt -ldl -lm
VERSION = PostgreSQL 9.2.8



---
Jeff Frost <jeff@pgexperts.com>
CTO, PostgreSQL Experts, Inc.
Phone: 1-888-PG-EXPRT x506
FAX: 415-762-5122
http://www.pgexperts.com/