Hi! My short answers on your questions.
Q: Have you clean up the old version ? A: No, I haven't cleaned up old version. Q: Is a system wide or a HOME installation ? A: It is a system wide. I found the libs of new GSL version here : /usr/local/lib libgsl.a libgsl.la libgsl.so libgsl.so.23 libgsl.so.23.1.0 libgslcblas.a libgslcblas.la libgslcblas.so libgslcblas.so.0 libgslcblas.so.0.0.0 pkgconfig All new files with extention *.h are here - /usr/local/include/gsl A: But old version is saved too. You are fully right - it is a competition between different installed versions of GSL. How abput to use old or new versions if to change the the paths for include files in different gcc ? Instead #include <stdio.h> #include <stdlib.h> #include <gsl/gsl_filter.h> to use next variants: #include </usr/local/include/gsl/gsl_filter.h> or and to add a new PATH for gcc: usr/bin/gcc -Wall `pkg-config --cflags --libs plplot` -I/usr/local/include -c $1 /usr/bin/gcc -L/usr/lib -L/usr/local/lib ./$FirstOfile `pkg-config --cflags --libs plplot` -lgsl -lgslcblas -lm $(mysql_config --libs) -o ./$HeadOfInpFile Thank you! Serge.
