I succeeded in compiling and installing the GDD package under my FreeBSD 6.1 box after eliminating ifdef DEBUG ? ?PKG_CFLAGS+=-DJGD_DEBUG endif in Makevars.in Now, with the following code .............................................. grafico1<- function() { plot(1:length(tabella[,1]),tabella[,2],ylim=c(Ymin,Ymax),type="h", lwd=6,col="red",main=paste("TEMPERATURE MEDIE GIORNALIERE\nMESE DI", toupper(format(ierid,"%B")),sep=" "), col.main="dark blue", xlab="Giorni del mese",ylab="?C", col.lab="blue",axes=FALSE) lines(1:length(tabella[,1]),tabella[,3],type="l",lwd=2,col="dark green") legend(1,Ymax,c(substring(FineMeseAnnoPrima,1,4),substring(Ieri,1,4)), col=c("dark green","red"),lty=c(1,1),lwd=4,bty="n") axis(1,at=1:length(tabella[,1]),lab=1:length(tabella[,1]),col="brown4", col.axis="brown4") axis(2,at=seq(Ymin,Ymax,by=2),lab=seq(Ymin,Ymax,by=2), col="brown4",col.axis="brown4",las=2) axis(4,at=seq(Ymin,Ymax,by=2),lab=seq(Ymin,Ymax,by=2), col="brown4",col.axis="brown4",las=2) grid(NA,ny=NULL,col="pink",lty="dotted") } # # GDD(file="temperature",type="png",width=600,height=480) grafico1() dev.off() While under X11 grafico1() produces *** thick *** red histograms due to the lwd=6 (and col="red", of course) option in the plot command, under GDD the png (but also gif and jpg) results in a graph with very thin histograms as if the lwd option doesn't exert any influence at all (I checked also with lwd=160 to no avail). What should I do? Ciao Vittorio