Fixes for android build

android/jni/Android.mk

@@ -59,6 +59,7 @@ include $(CLEAR_VARS)
 LOCAL_MODULE := libetpan
 LOCAL_SRC_FILES := ../build/libetpan-android-1/libs/$(TARGET_ARCH_ABI)/libetpan.a
 LOCAL_EXPORT_C_INCLUDES := build/libetpan-android-1/include
+LOCAL_EXPORT_LDLIBS := -lz
 include $(PREBUILT_STATIC_LIBRARY)
 
 include $(CLEAR_VARS)
@@ -70,7 +71,7 @@ include $(PREBUILT_STATIC_LIBRARY)
 include $(CLEAR_VARS)
 LOCAL_MODULE     := pEpJNIAdapter
 LOCAL_SHARED_LIBRARIES := libgpgme
-LOCAL_STATIC_LIBRARIES := openssl cyrus-sasl libetpan pEpEngine
+LOCAL_STATIC_LIBRARIES := pEpEngine libetpan openssl cyrus-sasl 
 LOCAL_CPP_FEATURES += exceptions
 LOCAL_SRC_FILES  := \
 		  ../../src/org_pEp_jniadapter_Engine.cc \

src/gen_cpp_Message.ysl2

@@ -14,6 +14,7 @@ tstylesheet {
         #include <exception>
         #include <new>
         #include <stdint.h>
+        #include <stdlib.h>
         #include <assert.h>
         #include <pEp/«@name».h>
 

src/jniutils.cc

@@ -2,9 +2,23 @@
 
 #include <stdexcept>
 #include <typeinfo>
+#include <time.h>
+#include <stdlib.h>
 #include <assert.h>
 #include <string>
 
+#ifdef ANDROID
+#include <time64.h>
+time_t timegm(struct tm* const t) {
+    static const time_t kTimeMax = ~(1L << (sizeof(time_t) * CHAR_BIT - 1));
+    static const time_t kTimeMin = (1L << (sizeof(time_t) * CHAR_BIT - 1));
+    time64_t result = timegm64(t);
+    if (result < kTimeMin || result > kTimeMax)
+        return -1;
+    return result;
+}
+#endif
+
 namespace pEp {
     namespace JNIAdapter {
         jclass findClass(JNIEnv *env, const char *classname)