diff --git a/CMakeLists.txt b/CMakeLists.txt
index 793aed0..5946460 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -31,7 +31,7 @@ add_definitions("-DCOPYRIGHT=\"${COPYRIGHT}\"")
 set(IDENTIFIER "com.${COMPANY}.${APPLICATION_NAME}")
 add_definitions("-DIDENTIFIER=\"${IDENTIFIER}\"")
 # raspberry as only lxterminal not xterm
-if(NOT WIN32)
+if(NOT (WIN32 OR CYGWIN))
   find_program(BINARY_TERMINAL_BIN lxterminal)
   if(BINARY_TERMINAL_BIN)
     set(APPLICATION_DESKTOP_EXEC "${BINARY_TERMINAL_BIN} -e ${CMAKE_PROJECT_NAME}")
@@ -86,6 +86,7 @@ if(NOT DEFINED CMAKE_BUILD_TYPE OR "${CMAKE_BUILD_TYPE}" STREQUAL "")
   set(CMAKE_BUILD_TYPE Release CACHE STRING "Build type" FORCE)
 endif()
 message(STATUS "Build type set to: ${CMAKE_BUILD_TYPE}")
+message("CMake system: ${CMAKE_SYSTEM_NAME}")
 
 # set compiler
 include(FindCompiler)
@@ -174,12 +175,19 @@ if(LINUX)
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DUSE_CM108")
   endif()
 
-elseif (NOT WIN32)
+elseif (NOT WIN32 AND NOT CYGWIN)
   find_package(portaudio REQUIRED)
   if(PORTAUDIO_FOUND)
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DUSE_PORTAUDIO")
   endif()
 
+else()
+  set(ALSA_INCLUDE_DIRS "")
+  set(ALSA_LIBRARIES "")
+  set(UDEV_INCLUDE_DIRS "")
+  set(UDEV_LIBRARIES "")
+  set(PORTAUDIO_INCLUDE_DIRS "")
+  set(PORTAUDIO_LIBRARIES "")
 endif()
 
 # manage and fetch new data
@@ -194,13 +202,9 @@ add_subdirectory(${CUSTOM_MISC_DIR})
 add_subdirectory(src)
 
 # ctest
-# Note CMake will generate tests only if the enable_testing() command
-# has been invoked. The CTest module invokes the command automatically
-# when the BUILD_TESTING option is ON.
 include(CTest)
-if(BUILD_TESTING)
-  add_subdirectory(test)
-endif()
+enable_testing()
+add_subdirectory(test)
 
 # manage scripts
 add_subdirectory(scripts)
diff --git a/cmake/modules/FindGPSD.cmake b/cmake/modules/FindGPSD.cmake
index 7973b35..d21b331 100644
--- a/cmake/modules/FindGPSD.cmake
+++ b/cmake/modules/FindGPSD.cmake
@@ -80,6 +80,7 @@ else (GPSD_LIBRARIES AND GPSD_INCLUDE_DIRS)
 
 endif (GPSD_LIBRARIES AND GPSD_INCLUDE_DIRS)
 
+# maybe on CYGWIN gpsd works
 if (WIN32)
   set(GPSD_FOUND FALSE)
   set(GPSD_LIBRARIES "")
diff --git a/conf/CMakeLists.txt b/conf/CMakeLists.txt
index 6cdf1f2..df0e27b 100644
--- a/conf/CMakeLists.txt
+++ b/conf/CMakeLists.txt
@@ -5,7 +5,7 @@ if(LINUX)
   string(REGEX REPLACE "\n%W%[^\n]*" "" file_content "${file_content}")
   string(REGEX REPLACE "\n%M%[^\n]*" "" file_content "${file_content}")
   string(REGEX REPLACE "\n%L%([^\n]*)" "\n\\1" file_content "${file_content}")
-elseif(WIN32)
+elseif(WIN32 OR CYGWIN)
   string(REGEX REPLACE "\n%M%[^\n]*" "" file_content "${file_content}")
   string(REGEX REPLACE "\n%L%[^\n]*" "" file_content "${file_content}")
   string(REGEX REPLACE "\n%W%([^\n]*)" "\n\\1" file_content "${file_content}")
@@ -36,7 +36,7 @@ install(FILES "${CUSTOM_CONF_DIR}/sdr.conf" DESTINATION share/doc/${CMAKE_PROJEC
 # This step would be done as ordinary user.
 # Some people like to put the direwolf config file in /etc/ax25.
 # Note that all of these are also in $(DESTDIR)/share/doc/direwolf/examples/.
-if(NOT WIN32)
+if(NOT (WIN32 OR CYGWIN))
   add_custom_target(install-conf
     COMMAND ${CMAKE_COMMAND}
     -DCUSTOM_BINARY_DIR="${CMAKE_BINARY_DIR}"
diff --git a/data/CMakeLists.txt b/data/CMakeLists.txt
index 7675b95..f15886a 100644
--- a/data/CMakeLists.txt
+++ b/data/CMakeLists.txt
@@ -86,8 +86,8 @@ ExternalProject_Add(download_symbolsx
   TEST_COMMAND ""
   )
 
-add_custom_target(data-update)
-add_dependencies(data-update data_rename download_tocalls download_symbols-new download_symbolsx)
+add_custom_target(update-data)
+add_dependencies(update-data data_rename download_tocalls download_symbols-new download_symbolsx)
 
 install(FILES "${CUSTOM_BINARY_DATA_DIR}/${TOCALLS_TXT}" DESTINATION share/${PROJECT_NAME})
 install(FILES "${CUSTOM_BINARY_DATA_DIR}/${SYMBOLS-NEW_TXT}" DESTINATION share/${PROJECT_NAME})
diff --git a/external/geotranz/CMakeLists.txt b/external/geotranz/CMakeLists.txt
index 2da168a..576d8b8 100644
--- a/external/geotranz/CMakeLists.txt
+++ b/external/geotranz/CMakeLists.txt
@@ -2,8 +2,7 @@
 
 set(GEOTRANZ_LIBRARIES geotranz CACHE INTERNAL "geotranz")
 
-set(geotranz_SOURCES
-  ${geotranz_SOURCES}
+list(APPEND geotranz_SOURCES
   error_string.c
   mgrs.c
   polarst.c
@@ -13,6 +12,6 @@ set(geotranz_SOURCES
   utm.c
   )
 
-ADD_LIBRARY(geotranz STATIC
+add_library(geotranz STATIC
   ${geotranz_SOURCES}
   )
diff --git a/external/misc/CMakeLists.txt b/external/misc/CMakeLists.txt
index 379d0f6..07b10b2 100644
--- a/external/misc/CMakeLists.txt
+++ b/external/misc/CMakeLists.txt
@@ -6,19 +6,20 @@ include_directories(
   )
 
 if(LINUX)
-  set(misc_SOURCES
-    ${misc_SOURCES}
+  list(APPEND misc_SOURCES
     # Provide our own copy of strlcpy and strlcat
     # because they are not included with Linux.
     ${CUSTOM_MISC_DIR}/strlcpy.c
     ${CUSTOM_MISC_DIR}/strlcat.c
     )
-  ADD_LIBRARY(misc STATIC
+
+  add_library(misc STATIC
     ${misc_SOURCES}
     )
-elseif(WIN32) # windows
-  set(misc_SOURCES
-    ${misc_SOURCES}
+
+elseif(WIN32 OR CYGWIN) # windows
+
+  list(APPEND misc_SOURCES
     # There are several string functions found in Linux
     # but not on Windows.  Need to provide our own copy.
     ${CUSTOM_MISC_DIR}/strsep.c
@@ -27,10 +28,14 @@ elseif(WIN32) # windows
     ${CUSTOM_MISC_DIR}/strlcpy.c
     ${CUSTOM_MISC_DIR}/strlcat.c
     )
-  ADD_LIBRARY(misc STATIC
+
+  add_library(misc STATIC
     ${misc_SOURCES}
     )
+
 else()
+
   # on macOS, OpenBSD and FreeBSD not misc is necessary
   set(MISC_LIBRARIES "" CACHE INTERNAL "")
+
 endif()
diff --git a/external/regex/CMakeLists.txt b/external/regex/CMakeLists.txt
index b33c708..6720763 100644
--- a/external/regex/CMakeLists.txt
+++ b/external/regex/CMakeLists.txt
@@ -1,21 +1,24 @@
 set(REGEX_LIBRARIES "" CACHE INTERNAL "")
 
-if(WIN32) # windows
+if(WIN32 OR CYGWIN) # windows
 
   set(REGEX_LIBRARIES regex CACHE INTERNAL "regex")
 
-  set(regex_SOURCES
-    ${regex_SOURCES}
+  list(APPEND regex_SOURCES
     # When building for Linux, we use regular expression
     # functions supplied by the gnu C library.
     # For the native WIN32 version, we need to use our own copy.
     # These were copied from http://gnuwin32.sourceforge.net/packages/regex.htm
     # Consider upgrading from https://www.gnu.org/software/libc/sources.html
-    #
-    # check if needed: -Dbool=int -Dtrue=1 -Dfalse=0
     ${CUSTOM_REGEX_DIR}/regex.c
     )
-  ADD_LIBRARY(regex STATIC
+
+  add_library(regex STATIC
     ${regex_SOURCES}
     )
+
+  set_target_properties(regex
+    PROPERTIES COMPILE_FLAGS "-Dbool=int -Dtrue=1 -Dfalse=0 -DUSE_REGEX_STATIC"
+    )
+
 endif()
diff --git a/scripts/CMakeLists.txt b/scripts/CMakeLists.txt
index dae8d50..7f849d6 100644
--- a/scripts/CMakeLists.txt
+++ b/scripts/CMakeLists.txt
@@ -1,5 +1,5 @@
 
-if(NOT WIN32)
+if(NOT (WIN32 OR CYGWIN))
   install(PROGRAMS "${CUSTOM_SCRIPTS_DIR}/dwespeak.sh" DESTINATION bin)
   install(PROGRAMS "${CUSTOM_SCRIPTS_DIR}/dw-start.sh" DESTINATION share/doc/${CMAKE_PROJECT_NAME}/examples)
   add_subdirectory(telemetry-toolkit)
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 4210892..76c233d 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -10,6 +10,12 @@ include_directories(
   ${CUSTOM_GEOTRANZ_DIR}
   )
 
+if(WIN32 OR CYGWIN)
+  include_directories(
+    ${CUSTOM_REGEX_DIR}
+  )
+endif()
+
 # build gen_fff to create fsk_fast_filter.h
 # optimization for slow processors
 list(APPEND gen_fff_SOURCES
@@ -105,17 +111,21 @@ if(LINUX)
       cm108.c
       )
   endif()
-  elseif(WIN32) # windows
+  elseif(WIN32 OR CYGWIN) # windows
     list(APPEND direwolf_SOURCES
       audio_win.c
 
       # icon
-      ${CMAKE_SOURCE_DIR}/cmake/cpack/direwolf.rc
+      # require plain gcc binary or link
+      #${CMAKE_SOURCE_DIR}/cmake/cpack/direwolf.rc
+      )
+    list(REMOVE_ITEM direwolf_SOURCES
+      dwgpsd.c
+      )
+  else() # macOS freebsd openbsd
+    list(APPEND direwolf_SOURCES
+      audio_portaudio.c
       )
-    else() # macOS freebsd openbsd
-      list(APPEND direwolf_SOURCES
-        audio_portaudio.c
-        )
 endif()
 
 add_executable(direwolf
@@ -136,6 +146,13 @@ target_link_libraries(direwolf
   ${PORTAUDIO_LIBRARIES}
   )
 
+if(WIN32 OR CYGWIN)
+  set_target_properties(direwolf
+    PROPERTIES COMPILE_FLAGS "-DUSE_REGEX_STATIC"
+    )
+  target_link_libraries(direwolf winmm ws2_32)
+endif()
+
 # decode_aprs
 list(APPEND decode_aprs_SOURCES
   decode_aprs.c
@@ -154,6 +171,12 @@ list(APPEND decode_aprs_SOURCES
   tt_text.c
   )
 
+if(WIN32 OR CYGWIN)
+  list(REMOVE_ITEM decode_aprs_SOURCES
+    dwgpsd.c
+    )
+endif()
+
 add_executable(decode_aprs
   ${decode_aprs_SOURCES}
   )
@@ -161,11 +184,12 @@ add_executable(decode_aprs
 add_dependencies(decode_aprs gen_fff)
 
 set_target_properties(decode_aprs
-  PROPERTIES COMPILE_FLAGS "-DDECAMAIN"
+  PROPERTIES COMPILE_FLAGS "-DDECAMAIN -DUSE_REGEX_STATIC"
   )
 
 target_link_libraries(decode_aprs
   ${MISC_LIBRARIES}
+  ${REGEX_LIBRARIES}
   Threads::Threads
   ${GPSD_LIBRARIES}
   )
@@ -306,6 +330,12 @@ list(APPEND atest_SOURCES
   textcolor.c
   )
 
+if(WIN32 OR CYGWIN)
+  list(REMOVE_ITEM atest_SOURCES
+    dwgpsd.c
+    )
+endif()
+
 add_executable(atest
   ${atest_SOURCES}
   )
@@ -315,9 +345,16 @@ add_dependencies(atest gen_fff)
 target_link_libraries(atest
   ${MISC_LIBRARIES}
   ${GPSD_LIBRARIES}
+  ${REGEX_LIBRARIES}
   Threads::Threads
   )
 
+if(WIN32 OR CYGWIN)
+  set_target_properties(atest
+    PROPERTIES COMPILE_FLAGS "-DUSE_REGEX_STATIC"
+    )
+endif()
+
 
 # Multiple AGWPE network or serial port clients to test TNCs side by side.
 # aclients
@@ -337,6 +374,10 @@ target_link_libraries(aclients
   Threads::Threads
   )
 
+if(WIN32 OR CYGWIN)
+  target_link_libraries(aclients ws2_32)
+endif()
+
 
 # Talk to a KISS TNC.
 # Note:  kiss_frame.c has conditional compilation on KISSUTIL.
@@ -365,6 +406,10 @@ target_link_libraries(kissutil
   Threads::Threads
   )
 
+if(WIN32 OR CYGWIN)
+  target_link_libraries(kissutil ws2_32)
+endif()
+
 
 # List USB audio adapters than can use GPIO for PTT.
 # cm108
@@ -406,6 +451,9 @@ target_link_libraries(ttcalc
   ${MISC_LIBRARIES}
   )
 
+if(WIN32 OR CYGWIN)
+  target_link_libraries(ttcalc ws2_32)
+endif()
 
 install(TARGETS direwolf DESTINATION bin)
 install(TARGETS decode_aprs DESTINATION bin)
diff --git a/src/beacon.c b/src/beacon.c
index 0bd5e98..07ea0d0 100644
--- a/src/beacon.c
+++ b/src/beacon.c
@@ -59,7 +59,6 @@
 #include "mheard.h"
 
 
-
 /*
  * Save pointers to configuration settings.
  */
diff --git a/src/direwolf.h b/src/direwolf.h
index 6df28ad..efc329b 100644
--- a/src/direwolf.h
+++ b/src/direwolf.h
@@ -113,7 +113,6 @@
 #define SLEEP_MS(n) usleep((n)*1000)
 #endif
 
-
 #if __WIN32__
 
 #define PTW32_STATIC_LIB
@@ -124,7 +123,7 @@
 #define _POSIX_C_SOURCE 1
 
 #else
-#include <pthread.h>
+ #include <pthread.h>
 #endif
 
 
diff --git a/src/dtime_now.c b/src/dtime_now.c
index 380f6e9..af7b98a 100644
--- a/src/dtime_now.c
+++ b/src/dtime_now.c
@@ -84,7 +84,6 @@ double dtime_now (void)
 }
 
 
-
 /*------------------------------------------------------------------
  *
  * Name:	timestamp_now
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 63160c8..3562dd0 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -1,4 +1,4 @@
-# this is a trick to avoid to more complication
+# this is a trick to avoid more complication
 # because configure_file() is done a configuration time
 set(CUSTOM_TEST_BINARY_DIR "${CMAKE_BINARY_DIR}/test")
 set(GEN_PACKETS_BIN "${CMAKE_BINARY_DIR}/src/gen_packets${CMAKE_EXECUTABLE_SUFFIX}")
@@ -83,6 +83,12 @@ include_directories(
   ${CMAKE_BINARY_DIR}/src
   )
 
+if(WIN32 OR CYGWIN)
+  include_directories(
+    ${CUSTOM_REGEX_DIR}
+  )
+endif()
+
 
 # Unit test for demodulators
 list(APPEND atest9_SOURCES
@@ -111,6 +117,12 @@ list(APPEND atest9_SOURCES
   ${CUSTOM_SRC_DIR}/tt_text.c
   )
 
+if(WIN32 OR CYGWIN)
+  list(REMOVE_ITEM atest9_SOURCES
+    ${CUSTOM_SRC_DIR}/dwgpsd.c
+    )
+endif()
+
 add_executable(atest9
   ${atest9_SOURCES}
   )
@@ -119,10 +131,18 @@ add_dependencies(atest9 gen_fff)
 
 target_link_libraries(atest9
   ${MISC_LIBRARIES}
+  ${REGEX_LIBRARIES}
   ${GPSD_LIBRARIES}
   Threads::Threads
   )
 
+if(WIN32 OR CYGWIN)
+  set_target_properties(atest9
+    PROPERTIES COMPILE_FLAGS "-DUSE_REGEX_STATIC"
+    )
+  target_link_libraries(atest9 ws2_32)
+endif()
+
 
 # Unit test for inner digipeater algorithm
 list(APPEND dtest_SOURCES
@@ -144,12 +164,18 @@ list(APPEND dtest_SOURCES
   ${CUSTOM_SRC_DIR}/tt_text.c
   )
 
+if(WIN32 OR CYGWIN)
+  list(REMOVE_ITEM dtest_SOURCES
+    ${CUSTOM_SRC_DIR}/dwgpsd.c
+    )
+endif()
+
 add_executable(dtest
   ${dtest_SOURCES}
   )
 
 set_target_properties(dtest
-  PROPERTIES COMPILE_FLAGS "-DDIGITEST"
+  PROPERTIES COMPILE_FLAGS "-DDIGITEST -DUSE_REGEX_STATIC"
   )
 
 target_link_libraries(dtest
@@ -159,6 +185,10 @@ target_link_libraries(dtest
   Threads::Threads
   )
 
+if(WIN32 OR CYGWIN)
+  target_link_libraries(dtest ws2_32)
+endif()
+
 
 # Unit test for APRStt tone seqence parsing.
 list(APPEND ttest_SOURCES
@@ -218,12 +248,18 @@ list(APPEND pftest_SOURCES
   ${CUSTOM_SRC_DIR}/tt_text.c
   )
 
+if(WIN32 OR CYGWIN)
+  list(REMOVE_ITEM pftest_SOURCES
+    ${CUSTOM_SRC_DIR}/dwgpsd.c
+    )
+endif()
+
 add_executable(pftest
   ${pftest_SOURCES}
   )
 
 set_target_properties(pftest
-  PROPERTIES COMPILE_FLAGS "-DPFTEST"
+  PROPERTIES COMPILE_FLAGS "-DPFTEST -DUSE_REGEX_STATIC"
   )
 
 target_link_libraries(pftest
@@ -233,6 +269,9 @@ target_link_libraries(pftest
   Threads::Threads
   )
 
+if(WIN32 OR CYGWIN)
+  target_link_libraries(pftest ws2_32)
+endif()
 
 # Unit test for telemetry decoding.
 list(APPEND tlmtest_SOURCES
@@ -242,12 +281,18 @@ list(APPEND tlmtest_SOURCES
   ${CUSTOM_SRC_DIR}/textcolor.c
   )
 
+if(WIN32 OR CYGWIN)
+  list(REMOVE_ITEM tlmtest_SOURCES
+    ${CUSTOM_SRC_DIR}/dwgpsd.c
+    )
+endif()
+
 add_executable(tlmtest
   ${tlmtest_SOURCES}
   )
 
 set_target_properties(tlmtest
-  PROPERTIES COMPILE_FLAGS "-DTEST"
+  PROPERTIES COMPILE_FLAGS "-DTEST -DUSE_REGEX_STATIC"
   )
 
 target_link_libraries(tlmtest
@@ -255,6 +300,10 @@ target_link_libraries(tlmtest
   ${REGEX_LIBRARIES}
   )
 
+if(WIN32 OR CYGWIN)
+  target_link_libraries(tlmtest ws2_32)
+endif()
+
 
 # Unit test for location coordinate conversion.
 list(APPEND lltest_SOURCES
@@ -322,7 +371,7 @@ add_executable(pad2test
   )
 
 set_target_properties(pad2test
-  PROPERTIES COMPILE_FLAGS "-DPAD2TEST"
+  PROPERTIES COMPILE_FLAGS "-DPAD2TEST -DUSE_REGEX_STATIC"
   )
 
 target_link_libraries(pad2test
@@ -330,6 +379,10 @@ target_link_libraries(pad2test
   ${REGEX_LIBRARIES}
   )
 
+if(WIN32 OR CYGWIN)
+  target_link_libraries(pad2test ws2_32)
+endif()
+
 
 # Unit Test for XID frame encode/decode.
 list(APPEND xidtest_SOURCES
@@ -414,6 +467,12 @@ if(OPTIONAL_TEST)
     ${CUSTOM_SRC_DIR}/symbols.c
     )
 
+  if(WIN32 OR CYGWIN)
+    list(REMOVE_ITEM itest_SOURCES
+      ${CUSTOM_SRC_DIR}/dwgpsd.c
+      )
+  endif()
+
   add_executable(itest
     ${itest_SOURCES}
     )
@@ -428,6 +487,10 @@ if(OPTIONAL_TEST)
     Threads::Threads
     )
 
+  if(WIN32 OR CYGWIN)
+    target_link_libraries(itest ws2_32)
+  endif()
+
 
   # For demodulator tweaking experiments.
   list(APPEND testagc_SOURCES
@@ -456,6 +519,12 @@ if(OPTIONAL_TEST)
     ${CUSTOM_SRC_DIR}/textcolor.c
     )
 
+  if(WIN32 OR CYGWIN)
+    list(REMOVE_ITEM testagc_SOURCES
+      ${CUSTOM_SRC_DIR}/dwgpsd.c
+      )
+  endif()
+
   add_executable(testagc
     ${testagc_SOURCES}
     )
@@ -468,6 +537,10 @@ if(OPTIONAL_TEST)
     Threads::Threads
     )
 
+  if(WIN32 OR CYGWIN)
+    target_link_libraries(testagc ws2_32)
+  endif()
+
 
   # Send GPS location to KISS TNC each second.
   list(APPEND walk96_SOURCES
@@ -515,10 +588,13 @@ if(OPTIONAL_TEST)
         ${CUSTOM_SRC_DIR}/cm108.c
         )
     endif()
-  elseif(WIN32) # windows
+  elseif(WIN32 OR CYGWIN) # windows
     list(APPEND walk96_SOURCES
       ${CUSTOM_SRC_DIR}/audio_win.c
       )
+    list(REMOVE_ITEM walk96_SOURCES
+      ${CUSTOM_SRC_DIR}/dwgpsd.c
+      )
   else() # macOS freebsd openbsd
     list(APPEND walk96_SOURCES
       ${CUSTOM_SRC_DIR}/audio_portaudio.c
@@ -530,7 +606,7 @@ if(OPTIONAL_TEST)
     )
 
   set_target_properties(walk96
-    PROPERTIES COMPILE_FLAGS "-DWALK96"
+    PROPERTIES COMPILE_FLAGS "-DWALK96 -DUSE_REGEX_STATIC"
     )
 
   target_link_libraries(walk96
@@ -544,6 +620,10 @@ if(OPTIONAL_TEST)
     Threads::Threads
     )
 
+  if(WIN32 OR CYGWIN)
+    target_link_libraries(walk96 ws2_32)
+  endif()
+
 
   # TODO  miss the audio file