From eb83556a59ec3a0a671d493bc381df95183daeac Mon Sep 17 00:00:00 2001
From: cmburn <33696630+cmburn@users.noreply.github.com>
Date: Thu, 3 Nov 2022 16:17:01 -0500
Subject: [PATCH] Add prefix flag config option to make_configure (#973)

---
 foreign_cc/configure.bzl                | 10 +++++++++-
 foreign_cc/private/configure_script.bzl |  4 +++-
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/foreign_cc/configure.bzl b/foreign_cc/configure.bzl
index 781f3abd1..f79d6189a 100644
--- a/foreign_cc/configure.bzl
+++ b/foreign_cc/configure.bzl
@@ -104,6 +104,7 @@ def _create_configure_script(configureParameters):
         inputs = inputs,
         env_vars = user_env,
         configure_in_place = ctx.attr.configure_in_place,
+        prefix_flag = ctx.attr.prefix_flag,
         autoconf = ctx.attr.autoconf,
         autoconf_options = ctx.attr.autoconf_options,
         autoreconf = ctx.attr.autoreconf,
@@ -194,10 +195,17 @@ def _attrs():
         "install_prefix": attr.string(
             doc = (
                 "Install prefix, i.e. relative path to where to install the result of the build. " +
-                "Passed to the 'configure' script with --prefix flag."
+                "Passed to the 'configure' script with the flag specified by prefix_flag."
             ),
             mandatory = False,
         ),
+        "prefix_flag": attr.string(
+            doc = (
+                "The flag to specify the install directory prefix with."
+            ),
+            mandatory = False,
+            default = "--prefix=",
+        ),
         "targets": attr.string_list(
             doc = (
                 "A list of targets within the foreign build system to produce. An empty string (`\"\"`) will result in " +
diff --git a/foreign_cc/private/configure_script.bzl b/foreign_cc/private/configure_script.bzl
index dce885a29..81b276320 100644
--- a/foreign_cc/private/configure_script.bzl
+++ b/foreign_cc/private/configure_script.bzl
@@ -17,6 +17,7 @@ def create_configure_script(
         inputs,
         env_vars,
         configure_in_place,
+        prefix_flag,
         autoconf,
         autoconf_options,
         autoreconf,
@@ -70,10 +71,11 @@ def create_configure_script(
         ).lstrip())
 
     script.append("##mkdirs## $$BUILD_TMPDIR$$/$$INSTALL_PREFIX$$")
-    script.append("{env_vars} {prefix}\"{configure}\" --prefix=$$BUILD_TMPDIR$$/$$INSTALL_PREFIX$$ {user_options}".format(
+    script.append("{env_vars} {prefix}\"{configure}\" {prefix_flag}$$BUILD_TMPDIR$$/$$INSTALL_PREFIX$$ {user_options}".format(
         env_vars = get_make_env_vars(workspace_name, tools, flags, env_vars, deps, inputs),
         prefix = configure_prefix,
         configure = configure_path,
+        prefix_flag = prefix_flag,
         user_options = " ".join(user_options),
     ))