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+# Changes for Ngspice version upgrade
+
+1. Manually add the GHDL server close patch (header files and `close_server` function at the appropriate location) in the `outitf.c` which comes with the new Ngspice version.
+
+> Note: Compare with previous version of NGHDL `outitf.c` file for applying the patch.
+
+2. Call this function `close_server()` in `outitf.c` before the line:
+    
+```c
+    fprintf(stdout, "\nNo. of Data Rows : %d\n", run->pointCount);
+```
+occurring in following two functions of `outitf.c` (may not be same in the future):
+```c
+    static void fileEnd(runDesc *run)
+```
+and
+```c
+    static void plotEnd(runDesc *run)
+```
+> Note:
+>   1. Do not replace old `outitf.c` with the `outitf.c` in the new Ngspice version.
+>   2. Make sure to maintain OS independence of the code, that is same code file for Windows and Linux.
+
+3. Similarly, manually add patch for identification of Mingw and linking of `libws2_32.a` to `makedefs.in` at *`/ngspice/src/xspice/icm`* **after the line `LIBS = -lm`** (important)
+```make
+    ISMINGW = $(shell uname | grep -c "MINGW64")
+    ifeq ($(ISMINGW), 1)
+      LIBS = -lm -lws2_32
+    endif
+     
+    ISMINGW = $(shell uname | grep -c "MINGW32")
+    ifeq ($(ISMINGW), 1)
+      LIBS = -lm -lws2_32
+    endif
+     
+    ISMINGW = $(shell uname | grep -c "MSYS")
+    ifeq ($(ISMINGW), 1)
+      LIBS = -lm -lws2_32
+    endif
+```
+
+4. Add patch for linking `libws2_32.a` in Windows OS at `Makefile.in` at *`/ngspice/src/`* by modifying the line:
+```make
+    @WINGUI_TRUE@am__append_19 = -lpsapi -lShlwapi 
+```
+To
+```make
+    @WINGUI_TRUE@am__append_19 = -lpsapi -lShlwapi -lws2_32
+```
+
+5. Add GHDL codemodel to the spinit.in file at *`/ngspice/src/`* as an addition to the section:
+```make
+    * The other codemodels
+```
+with the line:
+```make
+    @XSPICEINIT@ codemodel @pkglibdir@/ghdl.cm
+```
+and in `GNUmakefile.in` at *`/ngspice/src/xspice/icm`* by replacing the line:
+```make
+    CMDIRS = spice2poly digital analog xtradev xtraevt table
+```
+with
+```make
+    CMDIRS = spice2poly digital analog xtradev xtraevt table ghdl
+```
+
+6. Create a **`ghdl` folder** with two empty files named `modpath.lst` and `udnpath.lst` at the location *`/ngspice/src/xspice/icm/`*