Add a pkg-config file to the project.

I ended up having to edit CMakeLists.txt a bit to get it to work out.
So I modified the versioning in version.h to utilize the new variable I made.
No functionality is changed, just worked on the build system.

.gitignore

@@ -3,3 +3,5 @@ cmake-build-debug
 cmake-build-release
 
 CMakeCache\.txt
+pc/frnetlib.pc
+include/frnetlib/version.h

CMakeLists.txt

@@ -1,6 +1,12 @@
 cmake_minimum_required(VERSION 3.9)
 project(frnetlib)
+include(GNUInstallDirs)
 set(FRNETLIB_LINK_LIBRARIES "")
+set(FRNETLIB_LIBFLAGS "-lfrnetlib")
+
+set(FRNETLIB_VERSION_MAJOR 1)
+set(FRNETLIB_VERSION_MINOR 1)
+set(FRNETLIB_VERSION_PATCH 1)
 
 #Set module path
 set( CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_CURRENT_SOURCE_DIR}/cmake_modules)
@@ -14,7 +20,7 @@ set(FRNETLIB_BUILD_SHARED_LIBS false CACHE BOOL "Build shared library.")
 set(MAX_HTTP_HEADER_SIZE "0xC800" CACHE STRING "The maximum allowed HTTP header size in bytes")
 set(MAX_HTTP_BODY_SIZE "0xA00000" CACHE STRING "The maximum allowed HTTP body size in bytes")
 set(LISTEN_QUEUE_SIZE "64" CACHE STRING "The listen queue depth for fr::TcpListener/fr::SSLListener")
-set(CMAKE_BUILD_TYPE "Release" CACHE STRING "Build type" FORCE)
+set(CMAKE_BUILD_TYPE "Release" CACHE STRING "Build type")
 
 #Configure defines based on user options
 add_definitions(-DMAX_HTTP_HEADER_SIZE=${MAX_HTTP_HEADER_SIZE})
@@ -50,11 +56,14 @@ set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} ${CORE_CXX_FLAGS} -g -O0")
 set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} ${CORE_CXX_FLAGS} -O2")
 
 if(USE_SSL)
-	set(FRNETLIB_LINK_LIBRARIES ${FRNETLIB_LINK_LIBRARIES} ${MBEDTLS_LIBRARIES})
+    set(FRNETLIB_LINK_LIBRARIES ${FRNETLIB_LINK_LIBRARIES} ${MBEDTLS_LIBRARIES})
+    if( FRNETLIB_BUILD_SHARED_LIBS )
+        set(FRNETLIB_LIBFLAGS "${FRNETLIB_LIBFLAGS} -lmbedcrypto -lmbedx509")
+    endif()
 endif()
 
 if(NOT MSVC)
-	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pthread")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pthread")
 endif()
 
 # Set the library output directory
@@ -79,16 +88,12 @@ elseif(APPLE)
     set( LIB_PATH "lib" )
 else()
     set( SHARE_PATH "${CMAKE_INSTALL_PREFIX}/share/FRNETLIB" )
-
+    set( LIB_PATH "${CMAKE_INSTALL_LIBDIR}" )
-    if( LIB_SUFFIX )
-        set( LIB_PATH "lib${LIB_SUFFIX}" )
-    else()
-        set( LIB_PATH "lib" )
-    endif()
 endif()
 
 if(WIN32)
-	set(FRNETLIB_LINK_LIBRARIES ${FRNETLIB_LINK_LIBRARIES} wsock32 ws2_32)
+    set(FRNETLIB_LINK_LIBRARIES ${FRNETLIB_LINK_LIBRARIES} wsock32 ws2_32)
+    set(FRNETLIB_LIBFLAGS "${FRNETLIB_LIBFLAGS} -lwsock32 -lws2_32")
 endif()
 
 target_link_libraries(frnetlib ${FRNETLIB_LINK_LIBRARIES})
@@ -106,6 +111,16 @@ if(BUILD_EXAMPLES)
     add_subdirectory(examples)
 endif()
 
+configure_file(
+               "${CMAKE_SOURCE_DIR}/include/frnetlib/version.h.cmake.in"
+               "${CMAKE_SOURCE_DIR}/include/frnetlib/version.h"
+)
+configure_file(
+               "${CMAKE_SOURCE_DIR}/pc/frnetlib.pc.cmake.in"
+               "${CMAKE_SOURCE_DIR}/pc/frnetlib.pc"
+               @ONLY
+)
+
 install(
         TARGETS frnetlib
         RUNTIME DESTINATION bin COMPONENT bin
@@ -114,6 +129,10 @@ install(
 )
 
 install(
-        DIRECTORY include
+        DIRECTORY include/frnetlib
-        DESTINATION .
+        DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}"
+)
+install(
+        FILES "${CMAKE_CURRENT_SOURCE_DIR}/pc/frnetlib.pc"
+        DESTINATION "${CMAKE_INSTALL_LIBDIR}/pkgconfig/"
 )

include/frnetlib/version.h

@@ -1,18 +0,0 @@
-//
-// Created by fred.nicolson on 12/07/18.
-//
-
-#ifndef FRNETLIB_VERSION_H
-#define FRNETLIB_VERSION_H
-
-//Format: Major | Minor | Patch
-
-#define FRNETLIB_VERSION_MAJOR  1
-#define FRNETLIB_VERSION_MINOR  1
-#define FRNETLIB_VERSION_PATCH  1
-
-#define FRNETLIB_VERSION_NUMBER (FRNETLIB_VERSION_MAJOR * 100*100 + FRNETLIB_VERSION_MINOR * 100 + FRNETLIB_VERSION_PATCH)
-#define FRNETLIB_VERSION_STRING "1.1.1"
-#define FRNETLIB_VERSION_STRING_FULL "frnetlib 1.1.1"
-
-#endif //FRNETLIB_VERSION_H

include/frnetlib/version.h.cmake.in

@@ -0,0 +1,18 @@
+//
+// Created by fred.nicolson on 12/07/18.
+//
+
+#ifndef FRNETLIB_VERSION_H
+#define FRNETLIB_VERSION_H
+
+//Format: Major | Minor | Patch
+
+#define FRNETLIB_VERSION_MAJOR  @FRNETLIB_VERSION_MAJOR@
+#define FRNETLIB_VERSION_MINOR  @FRNETLIB_VERSION_MINOR@
+#define FRNETLIB_VERSION_PATCH  @FRNETLIB_VERSION_PATCH@
+
+#define FRNETLIB_VERSION_NUMBER (FRNETLIB_VERSION_MAJOR * 100*100 + FRNETLIB_VERSION_MINOR * 100 + FRNETLIB_VERSION_PATCH)
+#define FRNETLIB_VERSION_STRING "@FRNETLIB_VERSION_MAJOR@.@FRNETLIB_VERSION_MINOR@.@FRNETLIB_VERSION_PATCH@"
+#define FRNETLIB_VERSION_STRING_FULL "frnetlib @FRNETLIB_VERSION_MAJOR@.@FRNETLIB_VERSION_MINOR@.@FRNETLIB_VERSION_PATCH@"
+
+#endif //FRNETLIB_VERSION_H

pc/frnetlib.pc.cmake.in

@@ -0,0 +1,9 @@
+libdir=@CMAKE_INSTALL_FULL_LIBDIR@
+includedir=@CMAKE_INSTALL_FULL_INCLUDEDIR@
+
+Name: frnetlib
+Description: Frnetlib, is a cross-platform, small and fast networking library written in C++.
+URL: https://github.com/Cloaked9000/frnetlib
+Version: @FRNETLIB_VERSION_MAJOR@.@FRNETLIB_VERSION_MINOR@.@FRNETLIB_VERSION_PATCH@
+Libs: -L${libdir} @FRNETLIB_LIBFLAGS@
+Cflags: -I${includedir}