applied patch #1699435 - LIBRARY_IGNORE_VERSION

git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@5061 212acab6-be3b-0410-9dea-997c60f758d6

Docs/src/library.but

@@ -104,11 +104,23 @@ The Windows temp directory could be located on any volume, so you cannot use thi
 
 LIBRARY_SHELL_EXTENSION
 
-\b Define this before inserting InstallLib macro to call SHChangeNotify with SHCNE_ASSOCCHANGED after registration. Use this to refresh the shell when installing a shell extension or when changing file associations.
+\b Define this before inserting InstallLib macro to call SHChangeNotify with SHCNE_ASSOCCHANGED after registration.
+
+\b Use this to refresh the shell when installing a shell extension or when changing file associations.
 
 LIBRARY_COM
 
-\b Define this before inserting InstallLib macro to call CoFreeUnusedLibraries after registration. Use this for unloading all unnecessary libraries from memory when installing COM libraries.
+\b Define this before inserting InstallLib macro to call CoFreeUnusedLibraries after registration.
+
+\b Use this for unloading all unnecessary libraries from memory when installing COM libraries.
+
+LIBRARY_IGNORE_VERSION
+
+\b Define this before inserting InstallLib macro to ignore version information in the file and always install it, even if it already exists.
+
+\b Use this when an older or specific version is required.
+
+\b Not recommended for DLLs installed to $SYSDIR.
 
 \S1{} Notes
 

Include/Library.nsh

@@ -256,6 +256,8 @@
   ;------------------------
   ;Get version information
 
+  !ifndef LIBRARY_IGNORE_VERSION
+
     !insertmacro __InstallLib_Helper_GetVersion D "${LOCALFILE}"
 
     !ifdef LIBRARY_VERSION_FILENOTFOUND
@@ -355,6 +357,8 @@
 
     !endif
 
+  !endif
+
   ;------------------------
   ;Upgrade