xforms as supplied with Powertools breaks compilation of LyX. It seems to include something it shouldn't, leading to errors such as: In file included from formula.C:30: ../../src/minibuffer.h:17: using directive 'Object' introduced ambiguous type '_ObjectRec *' make[3]: *** [formula.lo] Error 1 I managed to get the compilation working by using an older RPM of xforms, namely 0.88-9
It's fixed in xforms-0.88-16. Note: we don't have xforms in 7.1, because it's not GPL. You could download the new packages from www.linux-easy.com.