diff -Naur primecoin-0.1.2-linux.orig/src/bitcoin-qt.pro primecoin-0.1.2-linux/src/bitcoin-qt.pro
--- primecoin-0.1.2-linux.orig/src/bitcoin-qt.pro	2013-08-05 08:37:14.000000000 -0400
+++ primecoin-0.1.2-linux/src/bitcoin-qt.pro	2013-11-30 16:39:48.464770389 -0500
@@ -4,7 +4,7 @@
 VERSION = 0.8.3
 INCLUDEPATH += src src/json src/qt
 QT += network
-DEFINES += QT_GUI BOOST_THREAD_USE_LIB BOOST_SPIRIT_THREADSAFE
+DEFINES += QT_GUI BOOST_THREAD_USE_LIB BOOST_SPIRIT_THREADSAFE LEVELDB_WITHOUT_MEMENV
 CONFIG += no_include_pwd
 CONFIG += thread
 
@@ -98,25 +98,29 @@
     QTPLUGIN += qcncodecs qjpcodecs qtwcodecs qkrcodecs qtaccessiblewidgets
 }
 
+contains(USE_SYSTEM_LEVELDB, 1) {
+    LIBS += -lleveldb
+} else {
 INCLUDEPATH += src/leveldb/include src/leveldb/helpers
-LIBS += $$PWD/src/leveldb/libleveldb.a $$PWD/src/leveldb/libmemenv.a
+LIBS += $$PWD/src/leveldb/libleveldb.a
 !win32 {
     # we use QMAKE_CXXFLAGS_RELEASE even without RELEASE=1 because we use RELEASE to indicate linking preferences not -O preferences
-    genleveldb.commands = cd $$PWD/src/leveldb && CC=$$QMAKE_CC CXX=$$QMAKE_CXX $(MAKE) OPT=\"$$QMAKE_CXXFLAGS $$QMAKE_CXXFLAGS_RELEASE\" libleveldb.a libmemenv.a
+    genleveldb.commands = cd $$PWD/src/leveldb && CC=$$QMAKE_CC CXX=$$QMAKE_CXX $(MAKE) OPT=\"$$QMAKE_CXXFLAGS $$QMAKE_CXXFLAGS_RELEASE\" libleveldb.a
 } else {
     # make an educated guess about what the ranlib command is called
     isEmpty(QMAKE_RANLIB) {
         QMAKE_RANLIB = $$replace(QMAKE_STRIP, strip, ranlib)
     }
     LIBS += -lshlwapi
-    genleveldb.commands = cd $$PWD/src/leveldb && CC=$$QMAKE_CC CXX=$$QMAKE_CXX TARGET_OS=OS_WINDOWS_CROSSCOMPILE $(MAKE) OPT=\"$$QMAKE_CXXFLAGS $$QMAKE_CXXFLAGS_RELEASE\" libleveldb.a libmemenv.a && $$QMAKE_RANLIB $$PWD/src/leveldb/libleveldb.a && $$QMAKE_RANLIB $$PWD/src/leveldb/libmemenv.a
+    genleveldb.commands = cd $$PWD/src/leveldb && CC=$$QMAKE_CC CXX=$$QMAKE_CXX TARGET_OS=OS_WINDOWS_CROSSCOMPILE $(MAKE) OPT=\"$$QMAKE_CXXFLAGS $$QMAKE_CXXFLAGS_RELEASE\" libleveldb.a && $$QMAKE_RANLIB $$PWD/src/leveldb/libleveldb.a
 }
 genleveldb.target = $$PWD/src/leveldb/libleveldb.a
 genleveldb.depends = FORCE
 PRE_TARGETDEPS += $$PWD/src/leveldb/libleveldb.a
 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
+QMAKE_CLEAN += $$PWD/src/leveldb/libleveldb.a; cd $$PWD/src/leveldb && $(MAKE) clean || true
 
 # regenerate src/build.h
 !win32|contains(USE_BUILD_INFO, 1) {
diff -Naur primecoin-0.1.2-linux.orig/src/src/leveldb.cpp primecoin-0.1.2-linux/src/src/leveldb.cpp
--- primecoin-0.1.2-linux.orig/src/src/leveldb.cpp	2013-08-05 08:37:20.000000000 -0400
+++ primecoin-0.1.2-linux/src/src/leveldb.cpp	2013-11-30 16:41:25.632773774 -0500
@@ -8,7 +8,9 @@
 #include <leveldb/env.h>
 #include <leveldb/cache.h>
 #include <leveldb/filter_policy.h>
-#include <memenv/memenv.h>
+#ifndef LEVELDB_WITHOUT_MEMENV
+#include <memenv.h>
+#endif
 
 #include <boost/filesystem.hpp>
 
@@ -43,8 +45,12 @@
     options = GetOptions(nCacheSize);
     options.create_if_missing = true;
     if (fMemory) {
+#ifndef LEVELDB_WITHOUT_MEMENV
         penv = leveldb::NewMemEnv(leveldb::Env::Default());
         options.env = penv;
+#else
+        throw std::runtime_error("CLevelDB(): compiled without memenv support");
+#endif
     } else {
         if (fWipe) {
             printf("Wiping LevelDB in %s\n", path.string().c_str());
diff -Naur primecoin-0.1.2-linux.orig/src/src/makefile.unix primecoin-0.1.2-linux/src/src/makefile.unix
--- primecoin-0.1.2-linux.orig/src/src/makefile.unix	2013-08-05 08:37:21.000000000 -0400
+++ primecoin-0.1.2-linux/src/src/makefile.unix	2013-11-30 17:20:06.545854617 -0500
@@ -111,8 +111,7 @@
 # adds some defaults in front. Unfortunately, LDFLAGS=... $(LDFLAGS) does not work.
 xLDFLAGS=$(LDHARDENING) $(LDFLAGS)
 
-OBJS= \
-    leveldb/libleveldb.a \
+BASEOBJS := \
     obj/alert.o \
     obj/version.o \
     obj/checkpoints.o \
@@ -121,7 +120,6 @@
     obj/crypter.o \
     obj/key.o \
     obj/db.o \
-    obj/init.o \
     obj/keystore.o \
     obj/main.o \
     obj/net.o \
@@ -141,25 +139,44 @@
     obj/hash.o \
     obj/bloom.o \
     obj/noui.o \
-    obj/leveldb.o \
     obj/txdb.o \
     obj/prime.o \
     obj/checkpointsync.o
 
+OBJS := \
+    obj/leveldb.o \
+    obj/init.o \
+    $(BASEOBJS)
+
+TESTOBJS := \
+    obj-test/leveldb.o \
+    $(patsubst test/%.cpp,obj-test/%.o,$(wildcard test/*.cpp)) \
+    $(BASEOBJS)
+
 all: primecoind
 
 test check: test_primecoin FORCE
 	./test_primecoin
 
+ifdef USE_SYSTEM_LEVELDB
+    LIBS += -lleveldb
+    TESTLIBS += -lmemenv
+else
 #
 # LevelDB support
 #
 MAKEOVERRIDES =
-LIBS += $(CURDIR)/leveldb/libleveldb.a $(CURDIR)/leveldb/libmemenv.a
+LIBS += $(CURDIR)/leveldb/libleveldb.a
+TESTLIBS += $(CURDIR)/leveldb/libmemenv.a
 DEFS += $(addprefix -I,$(CURDIR)/leveldb/include)
 DEFS += $(addprefix -I,$(CURDIR)/leveldb/helpers)
 leveldb/libleveldb.a:
-	@echo "Building LevelDB ..." && cd leveldb && $(MAKE) CC=$(CC) CXX=$(CXX) OPT="$(xCXXFLAGS)" libleveldb.a libmemenv.a && cd ..
+	@echo "Building LevelDB ..." && cd leveldb && $(MAKE) CC=$(CC) CXX=$(CXX) OPT="$(xCXXFLAGS)" libleveldb.a && cd ..
+leveldb/libmemenv.a:
+	@echo "Building LevelDB memenv ..." && cd leveldb && $(MAKE) CC=$(CC) CXX=$(CXX) OPT="$(xCXXFLAGS)" libmemenv.a && cd ..
+OBJS += leveldb/libleveldb.a
+TESTOBJS += leveldb/libmemenv.a
+endif
 
 # auto-generated dependencies:
 -include obj/*.P
@@ -170,24 +187,22 @@
 version.cpp: obj/build.h
 DEFS += -DHAVE_BUILD_INFO
 
-obj/%.o: %.cpp
-	$(CXX) -c $(xCXXFLAGS) -MMD -MF $(@:%.o=%.d) -o $@ $<
+P_TO_D = \
 	@cp $(@:%.o=%.d) $(@:%.o=%.P); \
-	  sed -e 's/#.*//' -e 's/^[^:]*: *//' -e 's/ *\\$$//' \
+	  sed -e 's/\#.*//' -e 's/^[^:]*: *//' -e 's/ *\\$$//' \
 	      -e '/^$$/ d' -e 's/$$/ :/' < $(@:%.o=%.d) >> $(@:%.o=%.P); \
 	  rm -f $(@:%.o=%.d)
 
-primecoind: $(OBJS:obj/%=obj/%)
-	$(LINK) $(xCXXFLAGS) -o $@ $^ $(xLDFLAGS) $(LIBS)
+obj/%.o: %.cpp
+	$(CXX) -c $(xCXXFLAGS) -DLEVELDB_WITHOUT_MEMENV -MMD -MF $(@:%.o=%.d) -o $@ $<
+	$(P_TO_D)
 
-TESTOBJS := $(patsubst test/%.cpp,obj-test/%.o,$(wildcard test/*.cpp))
+primecoind: $(OBJS)
+	$(LINK) $(xCXXFLAGS) -o $@ $^ $(xLDFLAGS) $(LIBS)
 
 obj-test/%.o: test/%.cpp
-	$(CXX) -c $(TESTDEFS) $(xCXXFLAGS) -MMD -MF $(@:%.o=%.d) -o $@ $<
-	@cp $(@:%.o=%.d) $(@:%.o=%.P); \
-	  sed -e 's/#.*//' -e 's/^[^:]*: *//' -e 's/ *\\$$//' \
-	      -e '/^$$/ d' -e 's/$$/ :/' < $(@:%.o=%.d) >> $(@:%.o=%.P); \
-	  rm -f $(@:%.o=%.d)
+	$(CXX) -c $(xCXXFLAGS) -DLEVELDB_WITHOUT_MEMENV -MMD -MF $(@:%.o=%.d) -o $@ $<
+	$(P_TO_D)
 
 test_primecoin: $(TESTOBJS) $(filter-out obj/init.o,$(OBJS:obj/%=obj/%))
 	$(LINK) $(xCXXFLAGS) -o $@ $(LIBPATHS) $^ $(TESTLIBS) $(xLDFLAGS) $(LIBS)