Changing the prefix for this libpg_query package

[Marc Coquand <marc@mccd.space>]

Hey everyone!

I am new to Guix, guile, make and trying to create a package. 

I have a functioning patch, attached, but it is not writing to the correct 
location. 

Currently, it is writing to out/usr/local/, which makes sense, because I can 
see in the makefile for libpg_query the following on line 311 of its makefile:

prefix = /usr/local
libdir = $(prefix)/lib
includedir = $(prefix)/include 

I know I need to change the prefix to be the guix out directory, but I 
am not sure how I can substitute these lines. As you can see in the patch
I attached, I tried to set it as a build flag. However, this did not work. 

Any helpers on how to resolve this? :) 

Sincerely,
Marc

---
 gnu/packages/libpg_query.scm | 63 ++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 gnu/packages/libpg_query.scm

diff --git a/gnu/packages/libpg_query.scm b/gnu/packages/libpg_query.scm
new file mode 100644
index 0000000000..353762554b
--- /dev/null
+++ b/gnu/packages/libpg_query.scm
@@ -0,0 +1,63 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2024 Marc Coquand <marc@mccd.space>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu packages libpg_query)
+  #:use-module (gnu packages)
+  #:use-module (gnu packages base)
+  #:use-module (gnu packages commencement)
+  #:use-module (guix packages)
+  #:use-module (guix utils)
+  #:use-module (guix download)
+  #:use-module (guix build-system gnu)
+  #:use-module ((guix licenses) #:prefix license:)
+ )
+
+(define-public libpg-query
+  (package
+    (name "libpg-query")
+    (version "16-5.1.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append
+             "https://github.com/pganalyze/libpg_query/archive/refs/tags/"
+             version ".tar.gz"))
+       (sha256
+        (base32 "1xvdcnqxrvb90kcndxmspnm07p8clnq160rbfsy6djd17mbmpwii"))))
+    (build-system gnu-build-system)
+    (arguments
+     `(#:make-flags (list "build" (string-append "prefix=" (assoc-ref %outputs "out")))
+
+       #:phases (modify-phases %standard-phases
+                  (delete 'configure)
+                  (delete 'check)
+                  (add-before 'build 'set-additional-paths
+                    (lambda* (#:key inputs #:allow-other-keys)
+                      (setenv "CC" "gcc")))
+                  (replace 'install
+                    (lambda* (#:key outputs #:allow-other-keys)
+                      (setenv "DESTDIR"
+                              (string-append (assoc-ref %outputs "out") "/"))
+                      (invoke "make" "install"))))))
+    (inputs (list tar which gcc-toolchain))
+    (home-page "https://github.com/pganalyze/libpg_query")
+    (synopsis
+     "C library for accessing the PostgreSQL parser outside of the server environment")
+    (description
+     "C library for accessing the PostgreSQL parser outside of the server.  This library uses the actual PostgreSQL server source to parse SQL queries and return the internal PostgreSQL parse tree.")
+    (license license:bsd-3)))

base-commit: fdbf4192f5eaa7fdb5e6e2e98ada0726c8104824
-- 
2.43.2