diff -ura original/flann-1.9.1/src/cpp/CMakeLists.txt patched/flann-1.9.1/src/cpp/CMakeLists.txt
--- original/flann-1.9.1/src/cpp/CMakeLists.txt	2018-03-06 22:37:57.382075683 +0100
+++ patched/flann-1.9.1/src/cpp/CMakeLists.txt	2018-03-06 22:39:23.750880552 +0100
@@ -4,8 +4,8 @@
 
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/flann/config.h.in ${CMAKE_CURRENT_SOURCE_DIR}/flann/config.h)
 
-file(GLOB_RECURSE C_SOURCES flann.cpp lz4.c lz4hc.c)
-file(GLOB_RECURSE CPP_SOURCES flann_cpp.cpp lz4.c lz4hc.c)
+file(GLOB_RECURSE C_SOURCES flann.cpp)
+file(GLOB_RECURSE CPP_SOURCES flann_cpp.cpp)
 file(GLOB_RECURSE CU_SOURCES *.cu)
 
 add_library(flann_cpp_s STATIC ${CPP_SOURCES})
@@ -31,7 +31,12 @@
 if(CMAKE_SYSTEM_NAME STREQUAL "Linux" AND CMAKE_COMPILER_IS_GNUCC)
     add_library(flann_cpp SHARED "")
     set_target_properties(flann_cpp PROPERTIES LINKER_LANGUAGE CXX)
-    target_link_libraries(flann_cpp -Wl,-whole-archive flann_cpp_s -Wl,-no-whole-archive)
+    target_link_libraries(flann_cpp
+        -Wl,-whole-archive
+        flann_cpp_s
+        -Wl,-no-whole-archive
+        lz4
+    )
 
     if (BUILD_CUDA_LIB)
 	    cuda_add_library(flann_cuda SHARED "")
@@ -85,7 +90,12 @@
     if(CMAKE_SYSTEM_NAME STREQUAL "Linux" AND CMAKE_COMPILER_IS_GNUCC)
         add_library(flann SHARED "")
         set_target_properties(flann PROPERTIES LINKER_LANGUAGE CXX)
-        target_link_libraries(flann -Wl,-whole-archive flann_s -Wl,-no-whole-archive)
+        target_link_libraries(flann
+            -Wl,-whole-archive
+            flann_s
+            -Wl,-no-whole-archive
+            lz4
+        )
     else()
         add_library(flann SHARED ${C_SOURCES})
 
@@ -112,7 +122,7 @@
 
 
 install (
-    TARGETS flann_cpp flann_cpp_s
+    TARGETS flann_cpp
     RUNTIME DESTINATION bin
     LIBRARY DESTINATION ${FLANN_LIB_INSTALL_DIR}
     ARCHIVE DESTINATION ${FLANN_LIB_INSTALL_DIR}
@@ -129,7 +139,7 @@
 
 if (BUILD_C_BINDINGS)
     install (
-        TARGETS flann flann_s
+        TARGETS flann
         RUNTIME DESTINATION bin
         LIBRARY DESTINATION ${FLANN_LIB_INSTALL_DIR}
         ARCHIVE DESTINATION ${FLANN_LIB_INSTALL_DIR}
diff -ura original/flann-1.9.1/src/cpp/flann/util/serialization.h patched/flann-1.9.1/src/cpp/flann/util/serialization.h
--- original/flann-1.9.1/src/cpp/flann/util/serialization.h	2018-03-06 22:37:57.383075669 +0100
+++ patched/flann-1.9.1/src/cpp/flann/util/serialization.h	2018-03-06 22:38:52.811308429 +0100
@@ -6,8 +6,8 @@
 #include <cstdlib>
 #include <cstring>
 #include <stdio.h>
-#include "flann/ext/lz4.h"
-#include "flann/ext/lz4hc.h"
+#include <lz4.h>
+#include <lz4hc.h>
 
 
 namespace flann