1 files changed, 9 insertions, 8 deletions
diff --git a/apt-pkg/versionmatch.h b/apt-pkg/versionmatch.h
index 433396fc9..4c8f704c8 100644
--- a/apt-pkg/versionmatch.h
+++ b/apt-pkg/versionmatch.h
@@ -35,16 +35,17 @@
 #ifndef PKGLIB_VERSIONMATCH_H
 #define PKGLIB_VERSIONMATCH_H
 
+#include <apt-pkg/pkgcache.h>
+#include <apt-pkg/cacheiterators.h>
 
 #include <string>
-#include <apt-pkg/pkgcache.h>
 
 #ifndef APT_8_CLEANER_HEADERS
 using std::string;
 #endif
 
 class pkgVersionMatch
-{   
+{
    // Version Matching
    std::string VerStr;
    bool VerPrefixMatch;
@@ -60,20 +61,20 @@ class pkgVersionMatch
    std::string RelComponent;
    std::string RelArchitecture;
    bool MatchAll;
-   
+
    // Origin Matching
    std::string OrSite;
-   
+
    public:
-   
+
    enum MatchType {None = 0,Version,Release,Origin} Type;
-   
-   bool MatchVer(const char *A,std::string B,bool Prefix);
+
+   bool MatchVer(const char *A,std::string B,bool Prefix) APT_PURE;
    bool ExpressionMatches(const char *pattern, const char *string);
    bool ExpressionMatches(const std::string& pattern, const char *string);
    bool FileMatch(pkgCache::PkgFileIterator File);
    pkgCache::VerIterator Find(pkgCache::PkgIterator Pkg);
-			       
+
    pkgVersionMatch(std::string Data,MatchType Type);
 };