Xcode4 Linking Problem. File was built for archive which is not the architecture being linked (arm6)

Question

Recently, I switched to Xcode4 and when I compile my project I got following error.

ld: warning: ignoring file /Users/myname/Library/Developer/Xcode/DerivedD         


        

Answer 1

I managed it by clicking the "unfriendly" Project's (in my case GMGridView). In tab "Architectures", I changed the value from something (I don't remember exactely anymore, I guess it was:) "armv7, armv6s" to "armv7, armv7". After that it worked for me.