diff --git a/CTestConfig.cmake b/CTestConfig.cmake
index 33ea84c..12347b6 100644
--- a/CTestConfig.cmake
+++ b/CTestConfig.cmake
@@ -3,7 +3,9 @@
 
 set(CTEST_PROJECT_NAME "KWSys")
 set(CTEST_NIGHTLY_START_TIME "21:00:00 EDT")
-set(CTEST_DROP_METHOD "http")
+if (NOT CTEST_DROP_METHOD STREQUAL "https")
+  set(CTEST_DROP_METHOD "http")
+endif ()
 set(CTEST_DROP_SITE "open.cdash.org")
 set(CTEST_DROP_LOCATION "/submit.php?project=PublicDashboard")
 set(CTEST_DROP_SITE_CDASH TRUE)
diff --git a/Glob.cxx b/Glob.cxx
index 5452f73..c6d4b19 100644
--- a/Glob.cxx
+++ b/Glob.cxx
@@ -27,7 +27,7 @@
 #include <cstdio>
 #include <cstring>
 namespace KWSYS_NAMESPACE {
-#if defined(_WIN32) || defined(__APPLE__) || defined(__CYGWIN__)
+#if defined(_WIN32) || defined(__APPLE__)
 // On Windows and Apple, no difference between lower and upper case
 #  define KWSYS_GLOB_CASE_INDEPENDENT
 #endif
diff --git a/SystemInformation.cxx b/SystemInformation.cxx
index ed1cdc0..9c34a56 100644
--- a/SystemInformation.cxx
+++ b/SystemInformation.cxx
@@ -863,7 +863,7 @@
 // Hide implementation details in an anonymous namespace.
 namespace {
 // *****************************************************************************
-#if defined(__linux) || defined(__APPLE__)
+#if defined(__linux) || defined(__APPLE__) || defined(__CYGWIN__)
 int LoadLines(FILE* file, std::vector<std::string>& lines)
 {
   // Load each line in the given file into a the vector.
@@ -893,7 +893,7 @@
   return nRead;
 }
 
-#  if defined(__linux)
+#  if defined(__linux) || defined(__CYGWIN__)
 // *****************************************************************************
 int LoadLines(const char* fileName, std::vector<std::string>& lines)
 {
@@ -926,7 +926,7 @@
 }
 #endif
 
-#if defined(__linux)
+#if defined(__linux) || defined(__CYGWIN__)
 // ****************************************************************************
 template <typename T>
 int GetFieldsFromFile(const char* fileName, const char** fieldNames, T* values)
@@ -3393,7 +3393,7 @@
     pos = buffer.find("processor\t", pos + 1);
   }
 
-#ifdef __linux
+#if defined(__linux) || defined(__CYGWIN__)
   // Count sockets.
   std::set<int> PhysicalIDs;
   std::string idc = this->ExtractValueFromCpuInfoFile(buffer, "physical id");
@@ -3414,8 +3414,8 @@
   this->NumberOfPhysicalCPU =
     NumberOfCoresPerSocket * (unsigned int)NumberOfSockets;
 
-#else // __CYGWIN__
-  // does not have "physical id" entries, neither "cpu cores"
+#else
+  // For systems which do not have "physical id" entries, neither "cpu cores"
   // this has to be fixed for hyper-threading.
   std::string cpucount =
     this->ExtractValueFromCpuInfoFile(buffer, "cpu count");
@@ -3597,7 +3597,7 @@
   GlobalMemoryStatusEx(&statex);
   return statex.ullTotalPhys / 1024;
 #  endif
-#elif defined(__linux)
+#elif defined(__linux) || defined(__CYGWIN__)
   long long memTotal = 0;
   int ierr = GetFieldFromFile("/proc/meminfo", "MemTotal:", memTotal);
   if (ierr) {
@@ -3712,6 +3712,16 @@
   GlobalMemoryStatusEx(&statex);
   return (statex.ullTotalPhys - statex.ullAvailPhys) / 1024;
 #  endif
+#elif defined(__CYGWIN__)
+  const char* names[3] = { "MemTotal:", "MemFree:", nullptr };
+  long long values[2] = { 0 };
+  int ierr = GetFieldsFromFile("/proc/meminfo", names, values);
+  if (ierr) {
+    return ierr;
+  }
+  long long& memTotal = values[0];
+  long long& memFree = values[1];
+  return memTotal - memFree;
 #elif defined(__linux)
   // First try to use MemAvailable, but it only works on newer kernels
   const char* names2[3] = { "MemTotal:", "MemAvailable:", nullptr };
@@ -3773,7 +3783,7 @@
     return -2;
   }
   return pmc.WorkingSetSize / 1024;
-#elif defined(__linux)
+#elif defined(__linux) || defined(__CYGWIN__)
   long long memUsed = 0;
   int ierr = GetFieldFromFile("/proc/self/status", "VmRSS:", memUsed);
   if (ierr) {
@@ -3850,7 +3860,8 @@
 #if defined(_WIN32)
   return GetCurrentProcessId();
 #elif defined(__linux) || defined(__APPLE__) || defined(__OpenBSD__) ||       \
-  defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__)
+  defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__) ||    \
+  defined(__CYGWIN__)
   return getpid();
 #else
   return -1;
diff --git a/SystemTools.cxx b/SystemTools.cxx
index 2c39b91..6144d9c 100644
--- a/SystemTools.cxx
+++ b/SystemTools.cxx
@@ -96,19 +96,12 @@
 #  if defined(_MSC_VER) && _MSC_VER >= 1800
 #    define KWSYS_WINDOWS_DEPRECATED_GetVersionEx
 #  endif
-#elif defined(__CYGWIN__)
-#  include <windows.h>
-#  undef _WIN32
 #endif
 
 #if !KWSYS_CXX_HAS_ENVIRON_IN_STDLIB_H
 extern char** environ;
 #endif
 
-#ifdef __CYGWIN__
-#  include <sys/cygwin.h>
-#endif
-
 // getpwnam doesn't exist on Windows and Cray Xt3/Catamount
 // same for TIOCGWINSZ
 #if defined(_WIN32) || defined(__LIBCATAMOUNT__) ||                           \
@@ -1290,15 +1283,7 @@
   if (path.empty()) {
     return false;
   }
-#if defined(__CYGWIN__)
-  // Convert path to native windows path if possible.
-  char winpath[MAX_PATH];
-  if (SystemTools::PathCygwinToWin32(path.c_str(), winpath)) {
-    return (GetFileAttributesA(winpath) != INVALID_FILE_ATTRIBUTES);
-  }
-  struct stat st;
-  return lstat(path.c_str(), &st) == 0;
-#elif defined(_WIN32)
+#if defined(_WIN32)
   return (GetFileAttributesW(Encoding::ToWindowsExtendedPath(path).c_str()) !=
           INVALID_FILE_ATTRIBUTES);
 #else
@@ -1320,14 +1305,7 @@
   if (filename.empty()) {
     return false;
   }
-#if defined(__CYGWIN__)
-  // Convert filename to native windows path if possible.
-  char winpath[MAX_PATH];
-  if (SystemTools::PathCygwinToWin32(filename.c_str(), winpath)) {
-    return (GetFileAttributesA(winpath) != INVALID_FILE_ATTRIBUTES);
-  }
-  return access(filename.c_str(), R_OK) == 0;
-#elif defined(_WIN32)
+#if defined(_WIN32)
   DWORD attr =
     GetFileAttributesW(Encoding::ToWindowsExtendedPath(filename).c_str());
   if (attr == INVALID_FILE_ATTRIBUTES) {
@@ -1433,24 +1411,6 @@
 #endif
 }
 
-#ifdef __CYGWIN__
-bool SystemTools::PathCygwinToWin32(const char* path, char* win32_path)
-{
-  auto itr = SystemToolsStatics->Cyg2Win32Map.find(path);
-  if (itr != SystemToolsStatics->Cyg2Win32Map.end()) {
-    strncpy(win32_path, itr->second.c_str(), MAX_PATH);
-  } else {
-    if (cygwin_conv_path(CCP_POSIX_TO_WIN_A, path, win32_path, MAX_PATH) !=
-        0) {
-      win32_path[0] = 0;
-    }
-    SystemToolsStatics->Cyg2Win32Map.insert(
-      SystemToolsStatic::StringMap::value_type(path, win32_path));
-  }
-  return win32_path[0] != 0;
-}
-#endif
-
 bool SystemTools::Touch(const std::string& filename, bool create)
 {
   if (!SystemTools::FileExists(filename)) {
diff --git a/SystemTools.hxx.in b/SystemTools.hxx.in
index 5dbb726..74dc176 100644
--- a/SystemTools.hxx.in
+++ b/SystemTools.hxx.in
@@ -331,15 +331,6 @@
   static int Stat(const char* path, Stat_t* buf);
   static int Stat(const std::string& path, Stat_t* buf);
 
-/**
- * Converts Cygwin path to Win32 path. Uses dictionary container for
- * caching and calls to cygwin_conv_to_win32_path from Cygwin dll
- * for actual translation.  Returns true on success, else false.
- */
-#ifdef __CYGWIN__
-  static bool PathCygwinToWin32(const char* path, char* win32_path);
-#endif
-
   /**
    * Return file length
    */