diff --git a/llvm/docs/LLVMBuild.rst b/llvm/docs/LLVMBuild.rst
--- a/llvm/docs/LLVMBuild.rst
+++ b/llvm/docs/LLVMBuild.rst
@@ -220,6 +220,11 @@
       If given, the name to use for the actual library file on disk. If
       not given, the name is derived from the component name itself.
 
+   -  ``prefix`` **[optional]**
+
+      If given, the prefix used when deriving the library filename from
+      ``library_name``. If not given, use the ``LLVM`` prefix.
+
    -  ``required_libraries`` **[optional]**
 
       If given, a list of the names of ``Library`` or ``LibraryGroup``
diff --git a/llvm/utils/llvm-build/llvmbuild/componentinfo.py b/llvm/utils/llvm-build/llvmbuild/componentinfo.py
--- a/llvm/utils/llvm-build/llvmbuild/componentinfo.py
+++ b/llvm/utils/llvm-build/llvmbuild/componentinfo.py
@@ -116,6 +116,7 @@
     def parse_items(items):
         kwargs = ComponentInfo.parse_items(items)
         kwargs['library_name'] = items.get_optional_string('library_name')
+        kwargs['prefix'] = items.get('prefix')
         kwargs['required_libraries'] = items.get_list('required_libraries')
         kwargs['add_to_library_groups'] = items.get_list(
             'add_to_library_groups')
@@ -128,13 +129,16 @@
         return LibraryComponentInfo(subpath, **kwargs)
 
     def __init__(self, subpath, name, dependencies, parent, library_name,
-                 required_libraries, add_to_library_groups, installed):
+                 prefix, required_libraries, add_to_library_groups, installed):
         ComponentInfo.__init__(self, subpath, name, dependencies, parent)
 
         # If given, the name to use for the library instead of deriving it from
         # the component name.
         self.library_name = library_name
 
+        # If given, override the default component prefix.
+        self.prefix = prefix
+
         # The names of the library components which are required when linking
         # with this component.
         self.required_libraries = list(required_libraries)
@@ -175,6 +179,12 @@
     def get_library_name(self):
         return self.library_name or self.name
 
+    def get_library_prefix(self):
+        if self.prefix is None:
+            return 'LLVM'
+        else:
+            return self.prefix
+
     def get_prefixed_library_name(self):
         """
         get_prefixed_library_name() -> str
@@ -184,13 +194,9 @@
         """
 
         basename = self.get_library_name()
+        prefix = self.get_library_prefix()
 
-        # FIXME: We need to get the prefix information from an explicit project
-        # object, or something.
-        if basename in ('gtest', 'gtest_main'):
-            return basename
-
-        return 'LLVM%s' % basename
+        return '%s%s' % (prefix, basename)
 
     def get_llvmconfig_component_name(self):
         return self.get_library_name().lower()
@@ -204,9 +210,9 @@
       return OptionalLibraryComponentInfo(subpath, **kwargs)
 
     def __init__(self, subpath, name, dependencies, parent, library_name,
-                 required_libraries, add_to_library_groups, installed):
+                 prefix, required_libraries, add_to_library_groups, installed):
       LibraryComponentInfo.__init__(self, subpath, name, dependencies, parent,
-                                    library_name, required_libraries,
+                                    library_name, prefix, required_libraries,
                                     add_to_library_groups, installed)
 
 class LibraryGroupComponentInfo(ComponentInfo):
diff --git a/llvm/utils/unittest/LLVMBuild.txt b/llvm/utils/unittest/LLVMBuild.txt
--- a/llvm/utils/unittest/LLVMBuild.txt
+++ b/llvm/utils/unittest/LLVMBuild.txt
@@ -17,6 +17,7 @@
 [component_0]
 type = Library
 name = gtest
+prefix =
 parent = Libraries
 required_libraries = Support
 installed = 0
@@ -24,6 +25,7 @@
 [component_1]
 type = Library
 name = gtest_main
+prefix =
 parent = Libraries
 required_libraries = gtest
 installed = 0