--- TagsCheck.py
+++ TagsCheck.py
@@ -517,7 +517,7 @@ class TagsCheck(AbstractCheck.AbstractCheck):
                 base=is_devel.group(1)
                 dep=None
                 has_so=0
-                for f in pkg.files().keys():
+                for f in pkg.files():
                     if f.endswith('.so'):
                         has_so=1
                         break
@@ -686,6 +686,17 @@ class TagsCheck(AbstractCheck.AbstractCheck):
         for p in useless_provides:
             printError(pkg, 'useless-explicit-provides',p)
 
+        have_mono_reqs=False
+        for r in reqs + provs:
+            if r.startswith('mono('):
+                have_mono_reqs=True
+                break
+
+        if not have_mono_reqs:
+            for fname in pkg.files():
+                if fname.endswith('.dll'):
+                    printError(pkg, 'mono-versioned-deps-missing', fname)
+
         useless_reqs=set()
         for r in reqs:
             if not r in useless_reqs:
@@ -901,6 +912,11 @@ upgrade path. self-provides are autogenerated. Remove the provide.''',
 'obsolete-on-name',
 '''A package should not obsolete itself, as it can cause weird errors in tools.''',
 
+'mono-versioned-deps-missing',
+'''This package appears to be related to mono, but doesn't have versioned
+mono provides being generated. Add mono-devel to the buildrequires to
+build the package with the correct provides.''',
+
 'invalid-filepath-dependency',
 '''A package has a file or path based dependency that is not resolveable for 
 package solvers because it is not in the whitelist for path based dependencies