diff --git a/cmake/EthDependencies.cmake b/cmake/EthDependencies.cmake
index f5fdae74f..10fd84a2b 100644
--- a/cmake/EthDependencies.cmake
+++ b/cmake/EthDependencies.cmake
@@ -41,7 +41,7 @@ message(STATUS "ctest path: ${CTEST_COMMAND}")
 
 # Dependencies must have a version number, to ensure reproducible build. The version provided here is the one that is in the extdep repository. If you use system libraries, version numbers may be different.
 
-find_package (CryptoPP 5.6.2 EXACT REQUIRED)
+find_package (CryptoPP 5.6.2 REQUIRED)
 message(" - CryptoPP header: ${CRYPTOPP_INCLUDE_DIRS}")
 message(" - CryptoPP lib   : ${CRYPTOPP_LIBRARIES}")
 
diff --git a/libethash-cuda/CMakeLists.txt b/libethash-cuda/CMakeLists.txt
index c7bdc0923..e96027bf7 100644
--- a/libethash-cuda/CMakeLists.txt
+++ b/libethash-cuda/CMakeLists.txt
@@ -5,7 +5,7 @@ FIND_PACKAGE(CUDA REQUIRED)
 file(GLOB SRC_LIST "*.cpp" "*.cu")
 file(GLOB HEADERS "*.h" "*.cuh")
 
-set(CUDA_NVCC_FLAGS ${CUDA_NVCC_FLAGS};--std=c++11;--disable-warnings;--ptxas-options=-v;-use_fast_math;-lineinfo)
+set(CUDA_NVCC_FLAGS ${CUDA_NVCC_FLAGS};--disable-warnings;--ptxas-options=-v;-use_fast_math;-lineinfo)
 
 LIST(APPEND CUDA_NVCC_FLAGS_RELEASE -O3)
 LIST(APPEND CUDA_NVCC_FLAGS_DEBUG -G)
@@ -25,4 +25,4 @@ CUDA_ADD_LIBRARY(${EXECUTABLE} STATIC ${SRC_LIST} ${HEADERS})
 TARGET_LINK_LIBRARIES(${EXECUTABLE} ${CUDA_LIBRARIES} ethash)
 
 install( TARGETS ${EXECUTABLE} RUNTIME DESTINATION bin ARCHIVE DESTINATION lib LIBRARY DESTINATION lib )
-install( FILES ${HEADERS} DESTINATION include/${EXECUTABLE} )
\ No newline at end of file
+install( FILES ${HEADERS} DESTINATION include/${EXECUTABLE} )
diff --git a/libethcore/Ethash.cpp b/libethcore/Ethash.cpp
index 6026828dc..211b6896a 100644
--- a/libethcore/Ethash.cpp
+++ b/libethcore/Ethash.cpp
@@ -111,7 +111,7 @@ void Ethash::BlockHeaderRaw::verifyParent(BlockHeaderRaw const& _parent)
 	if (m_gasLimit < c_minGasLimit ||
 		m_gasLimit <= _parent.m_gasLimit - _parent.m_gasLimit / c_gasLimitBoundDivisor ||
 		m_gasLimit >= _parent.m_gasLimit + _parent.m_gasLimit / c_gasLimitBoundDivisor)
-		BOOST_THROW_EXCEPTION(InvalidGasLimit() << errinfo_min((bigint)_parent.m_gasLimit - _parent.m_gasLimit / c_gasLimitBoundDivisor) << errinfo_got((bigint)m_gasLimit) << errinfo_max((bigint)_parent.m_gasLimit + _parent.m_gasLimit / c_gasLimitBoundDivisor));
+        	BOOST_THROW_EXCEPTION(InvalidGasLimit() << errinfo_min((bigint)(_parent.m_gasLimit - _parent.m_gasLimit / c_gasLimitBoundDivisor)) << errinfo_got((bigint)m_gasLimit) << errinfo_max((bigint)(_parent.m_gasLimit + _parent.m_gasLimit / c_gasLimitBoundDivisor)));
 }
 
 void Ethash::BlockHeaderRaw::populateFromParent(BlockHeaderRaw const& _parent)