Properly build secp256k1 for QT wallet

ion-qt.pro

@@ -120,6 +120,28 @@ QMAKE_EXTRA_TARGETS += genleveldb
 # Gross ugly hack that depends on qmake internals, unfortunately there is no other way to do it.
 QMAKE_CLEAN += $$PWD/src/leveldb/libleveldb.a; cd $$PWD/src/leveldb ; $(MAKE) clean
 
+
+#Build Secp256k1
+!win32 {
+INCLUDEPATH += src/secp256k1/include
+LIBS += $$PWD/src/secp256k1/src/libsecp256k1_la-secp256k1.o
+    # we use QMAKE_CXXFLAGS_RELEASE even without RELEASE=1 because we use RELEASE to indicate linking preferences not -O preferences
+    gensecp256k1.commands = cd $$PWD/src/secp256k1 && ./autogen.sh && ./configure --enable-module-recovery && CC=$$QMAKE_CC CXX=$$QMAKE_CXX $(MAKE) OPT=\"$$QMAKE_CXXFLAGS $$QMAKE_CXXFLAGS_RELEASE\"
+    gensecp256k1.target = $$PWD/src/secp256k1/src/libsecp256k1_la-secp256k1.o
+    gensecp256k1.depends = FORCE
+    PRE_TARGETDEPS += $$PWD/src/secp256k1/src/libsecp256k1_la-secp256k1.o
+    QMAKE_EXTRA_TARGETS += gensecp256k1
+    # Gross ugly hack that depends on qmake internals, unfortunately there is no other way to do it.
+    QMAKE_CLEAN += $$PWD/src/secp256k1/src/libsecp256k1_la-secp256k1.o; cd $$PWD/src/secp256k1; $(MAKE) clean
+} else {
+    isEmpty(SECP256K1_LIB_PATH) {
+        windows:SECP256K1_LIB_PATH=C:/dev/coindeps32/Secp256k1/lib
+    }
+    isEmpty(SECP256K1_INCLUDE_PATH) {
+        windows:SECP256K1_INCLUDE_PATH=C:/dev/coindeps32/Secp256k1/include
+    }
+}
+
 # regenerate src/build.h
 !windows|contains(USE_BUILD_INFO, 1) {
     genbuild.depends = FORCE