diff --git a/src/libotr-1-fixes.patch b/src/libotr-1-fixes.patch
new file mode 100644
index 00000000..8eb0dafa
--- /dev/null
+++ b/src/libotr-1-fixes.patch
@@ -0,0 +1,23 @@
+This file is part of MXE. See LICENSE.md for licensing information.
+
+Contains ad hoc patches for cross building.
+
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Boris Nagaev <bnagaev@gmail.com>
+Date: Thu, 16 Mar 2017 04:09:42 +0100
+Subject: [PATCH] fix out-of-tree build
+
+Fix the error:
+libotr-4.1.1/toolkit/otr_parse.c:26:19: fatal error: proto.h:
+    No such file or directory
+
+diff --git a/toolkit/Makefile.am b/toolkit/Makefile.am
+index 1111111..2222222 100644
+--- a/toolkit/Makefile.am
++++ b/toolkit/Makefile.am
+@@ -1,4 +1,4 @@
+-AM_CPPFLAGS = -I$(includedir) -I../src @LIBGCRYPT_CFLAGS@
++AM_CPPFLAGS = -I$(includedir) -I$(top_srcdir)/src @LIBGCRYPT_CFLAGS@
+ 
+ noinst_HEADERS = aes.h ctrmode.h parse.h sesskeys.h readotr.h sha1hmac.h
+ 
diff --git a/src/libotr.mk b/src/libotr.mk
index 808d57aa..af1ed382 100644
--- a/src/libotr.mk
+++ b/src/libotr.mk
@@ -18,12 +18,11 @@ define $(PKG)_UPDATE
 endef
 
 define $(PKG)_BUILD
-    cd '$(1)' && ACLOCAL_PATH='$(PREFIX)/$(TARGET)/share/aclocal' autoreconf -fi
-    cd '$(1)' && ./configure \
+    cd '$(SOURCE_DIR)' && ACLOCAL_PATH='$(PREFIX)/$(TARGET)/share/aclocal' autoreconf -fi
+    cd '$(BUILD_DIR)' && '$(SOURCE_DIR)/configure' \
         $(MXE_CONFIGURE_OPTS) \
         --with-libgcrypt-prefix='$(PREFIX)/$(TARGET)'
 
-    $(MAKE) -C '$(1)' -j '$(JOBS)' $(if $(BUILD_SHARED), LDFLAGS=-no-undefined)
-    $(MAKE) -C '$(1)' -j 1 install
+    $(MAKE) -C '$(BUILD_DIR)' -j '$(JOBS)' $(if $(BUILD_SHARED), LDFLAGS=-no-undefined)
+    $(MAKE) -C '$(BUILD_DIR)' -j 1 install
 endef
-