diff --git a/Jenkinsfile b/Jenkinsfile
index 5588f1be..58736fdb 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -22,7 +22,7 @@ pipeline {
 						label "built-in"
 					}
 					steps {
-						sh("./configure --enable-opengl --enable-vulkan --without-vulkan-string-helper")
+						sh("./Makefile.pl --enable-opengl --enable-vulkan --without-vulkan-string-helper")
 						sh("make clean")
 						sh("make -j4")
 					}
@@ -32,7 +32,7 @@ pipeline {
 						label "built-in"
 					}
 					steps {
-						sh("./configure --enable-opengl --enable-stb-truetype --disable-freetype2 --cross --target=Windows --host=i686-w64-mingw32")
+						sh("./Makefile.pl --enable-opengl --enable-stb-truetype --disable-freetype2 --cross --target=Windows --host=i686-w64-mingw32")
 						sh("make clean")
 						sh("make -j4")
 					}
@@ -42,7 +42,7 @@ pipeline {
 						label "built-in"
 					}
 					steps {
-						sh("./configure --enable-opengl --enable-stb-truetype --disable-freetype2 --cross --target=Windows --host=x86_64-w64-mingw32")
+						sh("./Makefile.pl --enable-opengl --enable-stb-truetype --disable-freetype2 --cross --target=Windows --host=x86_64-w64-mingw32")
 						sh("make clean")
 						sh("make -j4")
 					}
diff --git a/configure b/Makefile.pl
similarity index 98%
rename from configure
rename to Makefile.pl
index 5ffbe544..519781ec 100755
--- a/configure
+++ b/Makefile.pl
@@ -187,7 +187,7 @@ print(OUT
 "	clang-format --verbose -i `find src include examples -name \"*.c\" -or -name \"*.h\" -or -name \"*.m\"`\n"
 );
 print(OUT
-"	perltidy -b -bext=\"/\" --paren-tightness=2 `find tools pl configure -name \"*.pl\"`\n"
+"	perltidy -b -bext=\"/\" --paren-tightness=2 `find tools pl Makefile.pl -name \"*.pl\"`\n"
 );
 print(OUT "\n");
 print(OUT "lib:");
diff --git a/README.txt b/README.txt
index f69b6365..744e7a8e 100644
--- a/README.txt
+++ b/README.txt
@@ -1,23 +1,25 @@
 
-Greetings - Welcome to the Milsko GUI Toolkit (Version pre-1.0) 
+Greetings - Welcome to the Milsko GUI Toolkit (Version pre-1.0)
 
-  This document contains a brief summary of the contents of this source 
-distributions and building instructions for Milsko GUI Toolkit. 
+  This document contains a brief summary of the contents of this source
+distributions and building instructions for Milsko GUI Toolkit.
 
                                   Requirements
 
-  Milsko requires the Windows environment with GDI (so anything NT or 9x) or 
-the Unix-like environment with X11 for runtime. 
+  Milsko requires either
+  * A Windows environment with GDI (so anything NT or 9x)
+  * A Mac OS environment with Cocoa (10.4 is the minimum tested)
+  * Unix-like environment with X11 for runtime.
 
-  To build Milsko for Windows, you must have one of following compilers: 
-  * Visual C++ 6.0 or newer 
-  * Borland C++ 5.5 or newer 
-  * Open Watcom 2.0 or newer 
-  * MinGW-w64 
+  To build Milsko for Windows, you must have one of following compilers:
+  * Visual C++ 6.0 or newer
+  * Borland C++ 5.5 or newer
+  * Open Watcom 2.0 or newer
+  * MinGW-w64
 
-  and for Unix-like: 
-  * GNU C Compiler 
-  * Clang 
+  and for Unix-like/Mac OS:
+  * GNU C Compiler
+  * Clang
 
 
                                     Contents
@@ -39,31 +41,31 @@ the Unix-like environment with X11 for runtime.
 
                                 Building Milsko
 
-  Building Milsko depends on the platform you use, and the compiler you use. 
+  Building Milsko depends on the platform you use, and the compiler you use.
 
 A. Visual C++
 -------------
 
-1) Run `nmake -f NTMakefile'. 
+1) Run `nmake -f NTMakefile'.
 
 B. Borland C++
 --------------
 
-1) Run `make -f BorMakefile'. 
+1) Run `make -f BorMakefile'.
 
 C. Open Watcom
 --------------
 
-1) Run `wmake -f WatMakefile'. 
+1) Run `wmake -f WatMakefile'.
 
 D. MinGW-w64/GCC/Clang
 ----------------------
 
-1) Determine if you need Vulkan and/or OpenGL. 
+1) Determine if you need Vulkan and/or OpenGL.
 
-2) Run `./configure'. 
-   For help, run `./configure --help'. 
+2) Run `./Makefile.pl'.
+   For help, run `./Makefile.pl --help'.
 
-3) Run `make'. 
+3) Run `make'.
 
- -- Nishi  (nishi@nishi.boats) 
+ -- Nishi  (nishi@nishi.boats)
diff --git a/tools/readme.pl b/tools/readme.pl
index c511f794..573d9573 100755
--- a/tools/readme.pl
+++ b/tools/readme.pl
@@ -105,8 +105,8 @@ l("1) Run `wmake -f WatMakefile'.");
 h("D. MinGW-w64/GCC/Clang");
 l("1) Determine if you need Vulkan and/or OpenGL.");
 l("");
-l("2) Run `./configure'.");
-l("   For help, run `./configure --help'.");
+l("2) Run `./Makefile.pl'.");
+l("   For help, run `./Makefile.pl --help'.");
 l("");
 l("3) Run `make'.");
 l("");