Add linking patch

.SRCINFO

@@ -1,7 +1,7 @@
 pkgbase = nix
 	pkgdesc = A purely functional package manager
 	pkgver = 2.3.1
-	pkgrel = 1
+	pkgrel = 2
 	url = https://nixos.org/nix
 	install = nix.install
 	arch = i686
@@ -17,7 +17,9 @@ pkgbase = nix
 	depends = editline
 	optdepends = archlinux-nix: tools to help with setup of Nix
 	source = https://nixos.org/releases/nix/nix-2.3.1/nix-2.3.1.tar.xz
+	source = ldflags.patch
 	sha256sums = bb6578e9f20eebab6d78469ecc59c450ac54f276e5a86a882015d98fecb1bc7b
+	sha256sums = 42350237d98785b30b0ee099405f2f1f7412f8a816162c22bd232ed3dbbe0305
 
 pkgname = nix
 

PKGBUILD

@@ -8,7 +8,7 @@
 
 pkgname=nix
 pkgver=2.3.1
-pkgrel=1
+pkgrel=2
 pkgdesc="A purely functional package manager"
 arch=('i686' 'x86_64' 'armv7h')
 url="https://nixos.org/nix"
@@ -17,16 +17,19 @@ depends=('gc' 'libsodium' 'boost' 'brotli' 'editline')
 optdepends=('archlinux-nix: tools to help with setup of Nix')
 makedepends=('bzip2' 'openssl')
 install=nix.install
-source=("https://nixos.org/releases/nix/nix-$pkgver/nix-$pkgver.tar.xz")
-sha256sums=('bb6578e9f20eebab6d78469ecc59c450ac54f276e5a86a882015d98fecb1bc7b')
+source=("https://nixos.org/releases/nix/nix-$pkgver/nix-$pkgver.tar.xz"
+        'ldflags.patch')
+sha256sums=('bb6578e9f20eebab6d78469ecc59c450ac54f276e5a86a882015d98fecb1bc7b'
+            '42350237d98785b30b0ee099405f2f1f7412f8a816162c22bd232ed3dbbe0305')
 
 prepare() {
   cd "$pkgname-$pkgver"
+  patch --forward --strip=1 --input="${srcdir}/ldflags.patch"
 }
 
 build () {
   cd "$pkgname-$pkgver"
-  ./configure --prefix=/usr \
+  CXXFLAGS='-D_GLIBCXX_USE_CXX11_ABI=0' ./configure --prefix=/usr \
               --libexecdir="/usr/lib/$pkgname" \
               --sysconfdir=/etc \
               --enable-gc

ldflags.patch

@@ -0,0 +1,24 @@
+diff --git a/mk/libraries.mk b/mk/libraries.mk
+index 307e29b9d05..25cb1b81da6 100644
+--- a/mk/libraries.mk
++++ b/mk/libraries.mk
+@@ -96,7 +96,9 @@ define build-library
+     ifneq ($(OS), Darwin)
+       $(1)_LDFLAGS_USE += -Wl,-rpath,$$(abspath $$(_d))
+     endif
+-    $(1)_LDFLAGS_USE += -L$$(_d) -l$$(patsubst lib%,%,$$(strip $$($(1)_NAME)))
++    # -L and -l might conflict with previously-installed libraries. Instead
++    #  pass the file directly to the linker.
++    $(1)_LDFLAGS_USE += -Wl,$$(_d)/$$($(1)_NAME).$(SO_EXT)
+ 
+     $(1)_INSTALL_PATH := $(DESTDIR)$$($(1)_INSTALL_DIR)/$$($(1)_NAME).$(SO_EXT)
+ 
+@@ -107,7 +109,7 @@ define build-library
+     $$($(1)_INSTALL_PATH): $$($(1)_OBJS) $$(_libs_final) | $(DESTDIR)$$($(1)_INSTALL_DIR)/
+ 	$$(trace-ld) $(CXX) -o $$@ -shared $$(LDFLAGS) $$(GLOBAL_LDFLAGS) $$($(1)_OBJS) $$($(1)_LDFLAGS) $$($(1)_LDFLAGS_PROPAGATED) $$(foreach lib, $$($(1)_LIBS), $$($$(lib)_LDFLAGS_USE_INSTALLED))
+ 
+-    $(1)_LDFLAGS_USE_INSTALLED += -L$$(DESTDIR)$$($(1)_INSTALL_DIR) -l$$(patsubst lib%,%,$$(strip $$($(1)_NAME)))
++    $(1)_LDFLAGS_USE_INSTALLED += -Wl,$$(DESTDIR)$$($(1)_INSTALL_DIR)/$$($(1)_NAME).$(SO_EXT)
+     ifneq ($(OS), Darwin)
+       ifeq ($(SET_RPATH_TO_LIBS), 1)
+         $(1)_LDFLAGS_USE_INSTALLED += -Wl,-rpath,$$($(1)_INSTALL_DIR)