fix windows build

We really should not have pkgconfig as a build requirement on windows.

CMakeLists.txt

@@ -66,14 +66,25 @@ endif()
 ########################################################################
 # Find build dependencies
 ########################################################################
-if(WIN32 AND NOT MINGW)
-    set(THREADS_USE_PTHREADS_WIN32 true)
-endif()
 find_package(Threads)
 find_package(PkgConfig)
-pkg_check_modules(LIBUSB libusb-1.0 IMPORTED_TARGET)
 
-if(NOT LIBUSB_FOUND)
+if(PKG_CONFIG_FOUND)
+    pkg_check_modules(LIBUSB libusb-1.0 IMPORTED_TARGET)
+else()
+    set(LIBUSB_LIBRARIES "" CACHE STRING "manual libusb path")
+    set(LIBUSB_INCLUDE_DIRS "" CACHE STRING "manual libusb includepath")
+endif()
+
+if(MSVC)
+    set(THREADS_PTHREADS_LIBRARY "" CACHE STRING "manual pthread-win32 path")
+    set(THREADS_PTHREADS_INCLUDE_DIR "" CACHE STRING "manual pthread-win32 includepath")
+else()
+    set(THREADS_PTHREADS_LIBRARY "" CACHE INTERNAL "manual pthread-win32 path")
+    set(THREADS_PTHREADS_INCLUDE_DIR "" CACHE INTERNAL "manual pthread-win32 includepath")
+endif()
+
+if(PKG_CONFIG_FOUND AND NOT LIBUSB_FOUND)
     message(FATAL_ERROR "LibUSB 1.0 required to compile rtl-sdr")
 endif()
 if(NOT THREADS_FOUND)
@@ -139,7 +150,7 @@ add_subdirectory(src)
 ########################################################################
 # Create Pkg Config File
 ########################################################################
-FOREACH(inc ${LIBUSB_INCLUDE_DIR})
+FOREACH(inc ${LIBUSB_INCLUDEDIR})
     LIST(APPEND RTLSDR_PC_CFLAGS "-I${inc}")
 ENDFOREACH(inc)
 

src/CMakeLists.txt

@@ -20,10 +20,12 @@
 ########################################################################
 add_library(rtlsdr SHARED librtlsdr.c
   tuner_e4k.c tuner_fc0012.c tuner_fc0013.c tuner_fc2580.c tuner_r82xx.c)
-target_link_libraries(rtlsdr PkgConfig::LIBUSB)
+target_link_libraries(rtlsdr ${LIBUSB_LIBRARIES} ${THREADS_PTHREADS_LIBRARY})
 target_include_directories(rtlsdr PUBLIC
   $<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}/include>
   $<INSTALL_INTERFACE:include>  # <prefix>/include
+  ${LIBUSB_INCLUDE_DIRS}
+  ${THREADS_PTHREADS_INCLUDE_DIR}
   )
 set_target_properties(rtlsdr PROPERTIES DEFINE_SYMBOL "rtlsdr_EXPORTS")
 set_target_properties(rtlsdr PROPERTIES OUTPUT_NAME rtlsdr)
@@ -36,10 +38,12 @@ generate_export_header(rtlsdr)
 ########################################################################
 add_library(rtlsdr_static STATIC librtlsdr.c
   tuner_e4k.c tuner_fc0012.c tuner_fc0013.c tuner_fc2580.c tuner_r82xx.c)
-target_link_libraries(rtlsdr_static PkgConfig::LIBUSB)
+target_link_libraries(rtlsdr ${LIBUSB_LIBRARIES} ${THREADS_PTHREADS_LIBRARY})
 target_include_directories(rtlsdr_static PUBLIC
   $<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}/include>
   $<INSTALL_INTERFACE:include>  # <prefix>/include
+  ${LIBUSB_INCLUDE_DIRS}
+  ${THREADS_PTHREADS_INCLUDE_DIR}
   )
 set_property(TARGET rtlsdr_static APPEND PROPERTY COMPILE_DEFINITIONS "rtlsdr_STATIC" )
 if(NOT WIN32)
@@ -58,8 +62,8 @@ IF(MSVC)
         ${CMAKE_CURRENT_SOURCE_DIR}/rtlsdr.rc.in
         ${CMAKE_CURRENT_BINARY_DIR}/rtlsdr.rc
     @ONLY)
-  target_sources(rtlsdr ${CMAKE_CURRENT_BINARY_DIR}/rtlsdr.rc)
-  target_sources(rtlsdr_static ${CMAKE_CURRENT_BINARY_DIR}/rtlsdr.rc)
+  target_sources(rtlsdr PRIVATE ${CMAKE_CURRENT_BINARY_DIR}/rtlsdr.rc)
+  target_sources(rtlsdr_static PRIVATE ${CMAKE_CURRENT_BINARY_DIR}/rtlsdr.rc)
 ENDIF(MSVC)
 
 ########################################################################

src/rtl_tcp.c

@@ -35,6 +35,7 @@
 #include <fcntl.h>
 #else
 #include <winsock2.h>
+#include <WS2tcpip.h>
 #include "getopt/getopt.h"
 #endif