From 73d41228a94f8baedf1d0f3475b103c0e9f82590 Mon Sep 17 00:00:00 2001
From: Amos Bird <amosbird@gmail.com>
Date: Wed, 9 Sep 2020 17:13:32 +0800
Subject: [PATCH] Don't force system library path

When building with non-root toolchains (gentoo-prefix for instance), it confuses the toolchain to use non-existing libraries.
---
 configure.ac | 40 +++++++++++++++++++++-------------------
 1 file changed, 21 insertions(+), 19 deletions(-)

diff --git a/configure.ac b/configure.ac
index a6f1ce09..1f56a132 100644
--- a/configure.ac
+++ b/configure.ac
@@ -15,25 +15,27 @@ CC="$PTHREAD_CC"
 
 AX_CXX_COMPILE_STDCXX_14([noext], [mandatory])
 
-for defdir in /opt/local /usr/local; do
-    if test -d "$defdir/include"; then
-        CPPFLAGS="$CPPFLAGS -I$defdir/include"
-    fi
-done
-
-for defdir in /opt/local /usr/local /usr /; do
-
-    if test -d "$defdir/lib64"; then
-        LDFLAGS="$LDFLAGS -L$defdir/lib64"
-    fi
-    if test -d "$defdir/lib"; then
-        LDFLAGS="$LDFLAGS -L$defdir/lib"
-    fi
-
-    if test -d "$defdir/lib/x86_64-linux-gnu"; then
-        LDFLAGS="$LDFLAGS -L$defdir/lib/x86_64-linux-gnu"
-    fi
-done
+if test x"${without-system-paths}" != x"yes"; then
+    for defdir in /opt/local /usr/local; do
+        if test -d "$defdir/include"; then
+            CPPFLAGS="$CPPFLAGS -I$defdir/include"
+        fi
+    done
+
+    for defdir in /opt/local /usr/local /usr /; do
+
+        if test -d "$defdir/lib64"; then
+            LDFLAGS="$LDFLAGS -L$defdir/lib64"
+        fi
+        if test -d "$defdir/lib"; then
+            LDFLAGS="$LDFLAGS -L$defdir/lib"
+        fi
+
+        if test -d "$defdir/lib/x86_64-linux-gnu"; then
+            LDFLAGS="$LDFLAGS -L$defdir/lib/x86_64-linux-gnu"
+        fi
+    done
+fi
 
 dnl abssrcdir is the absolute path to the source base (regardless of where
 dnl you are building it)