diff --git a/CMakeLists.txt b/CMakeLists.txt
index fe059292..cf6be263 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -120,7 +120,7 @@ endforeach()
 include(CMakePushCheckState)
 include(CheckCXXSourceCompiles)
 cmake_push_check_state()
-set(CMAKE_REQUIRED_DEFINITIONS "${CMAKE_REQUIRED_DEFINITIONS} ${CXX1XCXXFLAGS}")
+set(CMAKE_REQUIRED_DEFINITIONS "${CXX1XCXXFLAGS}")
 # Check that std::future is available.
 check_cxx_source_compiles("
 #include <vector>
@@ -429,7 +429,6 @@ add_subdirectory(contrib)
 add_subdirectory(script)
 
 
-# XXX fix shared/static library
 string(TOUPPER "${CMAKE_BUILD_TYPE}" _build_type)
 message(STATUS "summary of build options:
 
@@ -445,9 +444,6 @@ message(STATUS "summary of build options:
       CXXFLAGS:       ${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_${_build_type}}
       WARNCFLAGS:     ${WARNCFLAGS}
       CXX1XCXXFLAGS:  ${CXX1XCXXFLAGS}
-    Library:
-      Shared:         ${enable_shared}
-      Static:         ${enable_static}
     Python:
       Python:         ${PYTHON_EXECUTABLE}
       PYTHON_VERSION: ${PYTHON_VERSION_STRING}
diff --git a/cmake/ExtractValidFlags.cmake b/cmake/ExtractValidFlags.cmake
index 8e50d1f0..ccd57dc8 100644
--- a/cmake/ExtractValidFlags.cmake
+++ b/cmake/ExtractValidFlags.cmake
@@ -1,10 +1,11 @@
-# Convenience function that checks the availability
-# of certain C or C++ compiler flags and appends valid ones.
+# Convenience function that checks the availability of certain
+# C or C++ compiler flags and returns valid ones as a string.
 
 include(CheckCCompilerFlag)
 include(CheckCXXCompilerFlag)
 
 function(extract_valid_c_flags varname)
+  set(valid_flags)
   foreach(flag IN LISTS ARGN)
     string(REGEX REPLACE "[^a-zA-Z0-9_]+" "_" flag_var ${flag})
     set(flag_var "C_FLAG_${flag_var}")
@@ -17,6 +18,7 @@ function(extract_valid_c_flags varname)
 endfunction()
 
 function(extract_valid_cxx_flags varname)
+  set(valid_flags)
   foreach(flag IN LISTS ARGN)
     string(REGEX REPLACE "[^a-zA-Z0-9_]+" "_" flag_var ${flag})
     set(flag_var "CXX_FLAG_${flag_var}")
diff --git a/cmake/FindJemalloc.cmake b/cmake/FindJemalloc.cmake
index 667d2995..b7815fa0 100644
--- a/cmake/FindJemalloc.cmake
+++ b/cmake/FindJemalloc.cmake
@@ -9,7 +9,7 @@ pkg_check_modules(PC_JEMALLOC QUIET jemalloc)
 
 find_path(JEMALLOC_INCLUDE_DIR
   NAMES jemalloc/jemalloc.h
-  HINTS ${PC_PCJEMALLOC_INCLUDE_DIRS}
+  HINTS ${PC_JEMALLOC_INCLUDE_DIRS}
 )
 find_library(JEMALLOC_LIBRARY
   NAMES jemalloc
diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt
index 96fae077..b4926575 100644
--- a/examples/CMakeLists.txt
+++ b/examples/CMakeLists.txt
@@ -13,7 +13,7 @@ if(ENABLE_EXAMPLES)
     ${CMAKE_SOURCE_DIR}/src/includes
     ${CMAKE_SOURCE_DIR}/third-party
 
-    ${LIBEVENT_OPENSSL_INCLUDE_DIRS}
+    ${LIBEVENT_INCLUDE_DIRS}
     ${OPENSSL_INCLUDE_DIRS}
   )