suppress the error string if pkg-config doesn't exist
suppress the error string if pkg-config doesn't exist

bsn069/luvit,AndrewTsao/luvit,DBarney/luvit,AndrewTsao/luvit,luvit/luvit,kaustavha/luvit,sousoux/luvit,boundary/luvit,AndrewTsao/luvit,zhaozg/luvit,connectFree/lev,kaustavha/luvit,bsn069/luvit,luvit/luvit,sousoux/luvit,DBarney/luvit,GabrielNicolasAvellaneda/luvit-upstream,GabrielNicolasAvellaneda/luvit-upstream,boundary/luvit,kaustavha/luvit,rjeli/luvit,DBarney/luvit,GabrielNicolasAvellaneda/luvit-upstream,bsn069/luvit,GabrielNicolasAvellaneda/luvit-upstream,sousoux/luvit,sousoux/luvit,sousoux/luvit,boundary/luvit,rjeli/luvit,sousoux/luvit,rjeli/luvit,DBarney/luvit,boundary/luvit,rjeli/luvit,connectFree/lev,zhaozg/luvit,boundary/luvit,boundary/luvit