--- cmake-3.15.0/Source/kwsys/SystemInformation.cxx.orig	2019-07-17 15:07:17.000000000 +0300
+++ cmake-3.15.0/Source/kwsys/SystemInformation.cxx	2019-07-18 09:46:35.830666200 +0300
@@ -879,7 +879,7 @@
 // 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.
@@ -909,7 +909,7 @@
   return nRead;
 }
 
-#  if defined(__linux)
+#  if defined(__linux)  || defined(__CYGWIN__)
 // *****************************************************************************
 int LoadLines(const char* fileName, std::vector<std::string>& lines)
 {
@@ -942,7 +942,7 @@
 }
 #endif
 
-#if defined(__linux)
+#if defined(__linux) || defined(__CYGWIN__) || defined(__MSYS__)
 // ****************************************************************************
 template <typename T>
 int GetFieldsFromFile(const char* fileName, const char** fieldNames, T* values)
@@ -1542,7 +1542,7 @@
   this->QueryBSDProcessor();
 #elif defined(__hpux)
   this->QueryHPUXProcessor();
-#elif defined(__linux) || defined(__CYGWIN__)
+#elif defined(__linux) || defined(__CYGWIN__) || defined(__MSYS__)
   this->RetreiveInformationFromCpuInfoFile();
 #else
   this->QueryProcessor();
@@ -1567,7 +1567,7 @@
 #elif defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__NetBSD__) ||  \
   defined(__DragonFly__)
   this->QueryBSDMemory();
-#elif defined(__CYGWIN__)
+#elif defined(__CYGWIN__) || defined(__MSYS__)
   this->QueryCygwinMemory();
 #elif defined(_WIN32)
   this->QueryWindowsMemory();
@@ -3618,7 +3618,7 @@
   GlobalMemoryStatusEx(&statex);
   return statex.ullTotalPhys / 1024;
 #  endif
-#elif defined(__linux)
+#elif defined(__linux) || defined(__CYGWIN__)
   SystemInformation::LongLong memTotal = 0;
   int ierr = GetFieldFromFile("/proc/meminfo", "MemTotal:", memTotal);
   if (ierr) {
@@ -3743,7 +3743,7 @@
   GlobalMemoryStatusEx(&statex);
   return (statex.ullTotalPhys - statex.ullAvailPhys) / 1024;
 #  endif
-#elif defined(__linux)
+#elif defined(__linux)  || defined(__CYGWIN__)
   // First try to use MemAvailable, but it only works on newer kernels
   const char* names2[3] = { "MemTotal:", "MemAvailable:", NULL };
   SystemInformation::LongLong values2[2] = { SystemInformation::LongLong(0) };
@@ -3807,7 +3807,7 @@
     return -2;
   }
   return pmc.WorkingSetSize / 1024;
-#elif defined(__linux)
+#elif defined(__linux) || defined(__CYGWIN__)
   SystemInformation::LongLong memUsed = 0;
   int ierr = GetFieldFromFile("/proc/self/status", "VmRSS:", memUsed);
   if (ierr) {
@@ -3884,7 +3884,7 @@
 #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(__MSYS__)
   return getpid();
 #else
   return -1;
@@ -4196,7 +4196,7 @@
 
 bool SystemInformationImplementation::QueryCygwinMemory()
 {
-#ifdef __CYGWIN__
+#if defined __CYGWIN__ || defined __MSYS__
   // _SC_PAGE_SIZE does return the mmap() granularity on Cygwin,
   // see http://cygwin.com/ml/cygwin/2006-06/msg00350.html
   // Therefore just use 4096 as the page size of Windows.