diff -up ./CMakeLists.txt.fpic ./CMakeLists.txt
--- ./CMakeLists.txt.fpic	2019-01-20 08:57:28.000000000 +0100
+++ ./CMakeLists.txt	2019-01-21 11:44:06.556633427 +0100
@@ -24,9 +24,7 @@ set(HDR_SOVERSION ${HDR_SOVERSION_CURREN
 ENABLE_TESTING()
 
 if(UNIX)
-    set(CMAKE_C_FLAGS "-Wall -Wno-unknown-pragmas -Wextra -Wshadow -Winit-self -Wmissing-prototypes -Wpedantic -D_GNU_SOURCE -std=gnu89")
-    set(CMAKE_C_FLAGS_DEBUG "-O0 -g")
-    set(CMAKE_C_FLAGS_RELEASE "-O3 -g")
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC -D_GNU_SOURCE")
 endif()
 
 if(WIN32)