diff --git a/src/pkgconf-1-fixes.patch b/src/pkgconf-1-fixes.patch
new file mode 100644
index 00000000..9ed65e55
--- /dev/null
+++ b/src/pkgconf-1-fixes.patch
@@ -0,0 +1,50 @@
+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: Tony Theodore <tonyt@logyst.com>
+Date: Thu, 15 Jun 2017 21:05:31 +1000
+Subject: [PATCH] main: support undocumented PKG_CONFIG_SYSTEM_INCLUDE_PATH and
+ PKG_CONFIG_SYSTEM_LIBRARY_PATH environment variables.
+
+Backported from:
+https://github.com/pkgconf/pkgconf/commit/7e6fa325eb668c3462981a16fb4c36270832e00f
+
+See:
+https://github.com/mxe/mxe/pull/1785
+
+diff --git a/main.c b/main.c
+index 1111111..2222222 100644
+--- a/main.c
++++ b/main.c
+@@ -56,16 +56,27 @@ static char *sysroot_dir = NULL;
+ 
+ FILE *error_msgout = NULL;
+ 
++static char *
++fallback_getenv(const char *envname, const char *fallback)
++{
++	const char *data = getenv(envname);
++
++	if (data == NULL)
++		data = fallback;
++
++	return strdup(data);
++}
++
+ static bool
+ fragment_has_system_dir(pkg_fragment_t *frag)
+ {
+ 	switch (frag->type)
+ 	{
+ 	case 'L':
+-		if ((want_flags & PKG_KEEP_SYSTEM_CFLAGS) == 0 && !strcasecmp(SYSTEM_LIBDIR, frag->data))
++		if ((want_flags & PKG_KEEP_SYSTEM_CFLAGS) == 0 && !strcasecmp(fallback_getenv("PKG_CONFIG_SYSTEM_LIBRARY_PATH", SYSTEM_LIBDIR), frag->data))
+ 			return true;
+ 	case 'I':
+-		if ((want_flags & PKG_KEEP_SYSTEM_LIBS) == 0 && !strcasecmp(SYSTEM_INCLUDEDIR, frag->data))
++		if ((want_flags & PKG_KEEP_SYSTEM_LIBS) == 0 && !strcasecmp(fallback_getenv("PKG_CONFIG_SYSTEM_INCLUDE_PATH", SYSTEM_INCLUDEDIR), frag->data))
+ 			return true;
+ 	default:
+ 		break;
diff --git a/src/pkgconf.mk b/src/pkgconf.mk
index 49f363ae..5b462670 100644
--- a/src/pkgconf.mk
+++ b/src/pkgconf.mk
@@ -21,7 +21,12 @@ endef
 define $(PKG)_BUILD
     # create pkg-config script
     (echo '#!/bin/sh'; \
-     echo 'PKG_CONFIG_PATH="$(PREFIX)/$(TARGET)/qt5/lib/pkgconfig":"$$PKG_CONFIG_PATH_$(subst .,_,$(subst -,_,$(TARGET)))" PKG_CONFIG_LIBDIR='\''$(PREFIX)/$(TARGET)/lib/pkgconfig'\'' exec '$(PREFIX)/$(BUILD)/bin/pkgconf' $(if $(BUILD_STATIC),--static) "$$@"') \
+     echo 'PKG_CONFIG_PATH="$(PREFIX)/$(TARGET)/qt5/lib/pkgconfig":"$$PKG_CONFIG_PATH_$(subst .,_,$(subst -,_,$(TARGET)))" \
+           PKG_CONFIG_SYSROOT_DIR= \
+           PKG_CONFIG_LIBDIR="$(PREFIX)/$(TARGET)/lib/pkgconfig" \
+           PKG_CONFIG_SYSTEM_INCLUDE_PATH="$(PREFIX)/$(TARGET)/include" \
+           PKG_CONFIG_SYSTEM_LIBRARY_PATH="$(PREFIX)/$(TARGET)/lib" \
+           exec "$(PREFIX)/$(BUILD)/bin/pkgconf" $(if $(BUILD_STATIC),--static) "$$@"') \
              > '$(PREFIX)/bin/$(TARGET)-pkg-config'
     chmod 0755 '$(PREFIX)/bin/$(TARGET)-pkg-config'
 
diff --git a/src/qtbase.mk b/src/qtbase.mk
index f7453c94..3302e474 100644
--- a/src/qtbase.mk
+++ b/src/qtbase.mk
@@ -27,7 +27,7 @@ define $(PKG)_BUILD
         SYBASE_LIBS="-lsybdb `'$(TARGET)-pkg-config' --libs-only-l gnutls` -liconv -lws2_32" \
         PKG_CONFIG="${TARGET}-pkg-config" \
         PKG_CONFIG_SYSROOT_DIR="/" \
-        PKG_CONFIG_LIBDIR="$(PREFIX)/$(TARGET)/lib/pc" \
+        PKG_CONFIG_LIBDIR="$(PREFIX)/$(TARGET)/lib/pkgconfig" \
         ./configure \
             -opensource \
             -confirm-license \
diff --git a/src/sqlite.mk b/src/sqlite.mk
index 01a876b3..d317d717 100644
--- a/src/sqlite.mk
+++ b/src/sqlite.mk
@@ -18,9 +18,6 @@ define $(PKG)_UPDATE
 endef
 
 define $(PKG)_BUILD
-    # The system include path doesn't belong in CFLAGS
-    # Causes problems like https://gitlab.kitware.com/cmake/cmake/issues/16919
-    $(SED) -i 's/^Cflags/#Cflags/;' '$(1)/sqlite3.pc.in'
     cd '$(1)' && ./configure \
         $(MXE_CONFIGURE_OPTS) \
         --disable-readline \