diff -urN which-2.21.orig/which.c which-2.21/which.c
--- which-2.21.orig/which.c	2015-07-17 11:17:53.621936700 +0100
+++ which-2.21/which.c	2015-07-17 12:13:21.629563300 +0100
@@ -91,7 +91,14 @@
     if (abs_path)
       free(abs_path);
 
+#if defined(__MSYS__)
+    if (*name != '.' && *name != '/' && *name != '~'
+       && !((strlen (name) > 2
+            && tolower (name[0]) >= 'a' && tolower (name[0]) <= 'z'
+            && name[1] == ':' && name[2] == '/')))
+#else
     if (*name != '.' && *name != '/' && *name != '~')
+#endif
     {
       abs_path = (char *)xmalloc(3 + name_len);
       strcpy(abs_path, "./");
@@ -201,7 +208,14 @@
 
   int saw_slash = 0, saw_slash_dot = 0, saw_slash_dot_dot = 0;
 
+#if defined(__MSYS__)
+  if (*p1 != '/'
+      && !((strlen (p1) > 2
+           && tolower (p1[0]) >= 'a' && tolower (p1[0]) <= 'z'
+           && p1[1] == ':' && p1[2] == '/')))
+#else
   if (*p1 != '/')
+#endif
   {
     get_current_working_directory();
     strcpy(result, cwd);