First of all I would like to point that I'm new to Ubuntu so sorry if what I am asking is ridiculous. I have downloaded Scid 4.4 chess program and I have tried to compile it as it was explained on its website: 1) Initialize git. 2) Create a folder where you want to download and (?) compile the source, then cast: git init on your command line. 3) You're now ready to download the sources recall Fulvio's spell: git clone git://scid.git.sourceforge.net/gitroot/scid/scid This should get you the latest Scid source. 4) You're now ready to compile Scid. In principle, all you need to do is: ./configure and then make 5) If you get stuck, you probably need to get developer versions of tcl/tk. This translates into issuing these three commands: sudo apt-get install tcl8.5-dev sudo apt-get install tk8.5-dev sudo apt-get install zlib1g -dev 6) You should now be ready to compile The problem is that when I run ./configure to start compiling the following message appears on Terminal: configure: Makefile configuration program for Scid Tcl/Tk version: 8.5 Your operating system is: Linux 3.8.0-19-generic Location of "tcl.h": /usr/include/tcl8.5 Location of "tk.h": /usr/include/tcl8.5 Location of Tcl 8.5 library: not found Location of Tk 8.5 library: not found Checking if your system already has zlib installed: yes. Using Makefile.conf. Not all settings could be determined! The default Makefile was written. You will need to edit it before you can compile Scid. What should I do? Has anybody faced this problem before? Thanks in advance I have run ls -l /usr/include/tcl8.5/tcl.h here's the result: -rw-r--r-- 1 root root 87291 abr 22 10:45 /usr/include/tcl8.5/tcl.h I have also tried what you suggested Could you run git reset --hard HEAD and git clean -d -f to clean up everything using Git? Then run ./configure again. Just a shot in the dark - I've seen some GNU automake stuff still listening to its "cached" version of the results or something. Still no solution. I don't know why it can't recognize the library though it is installed I opened configure to see where the program looked for the library. This is the code: # libraryPath: List of possible locations of Tcl/Tk library. set libraryPath { /usr/lib /usr/lib64 /usr/local/tcl/lib /usr/local/lib /usr/X11R6/lib /opt/tcltk/lib /usr/lib/x86_64-linux-gnu } lappend libraryPath "/usr/lib/tcl${tclv}" lappend libraryPath "/usr/lib/tk${tclv}" lappend libraryPath "/usr/lib/tcl${tclv_nodot}" lappend libraryPath "/usr/lib/tk${tclv_nodot}" # Try to add tcl_library and auto_path values to libraryPath, # in case the user has a non-standard Tcl/Tk library location: if {[info exists ::tcl_library]} { lappend headerPath \ [file join [file dirname [file dirname $::tcl_library]] include] lappend libraryPath [file dirname $::tcl_library] lappend libraryPath $::tcl_library } if {[info exists ::auto_path]} { foreach name $::auto_path { lappend libraryPath $name } } if {! [info exists var(TCL_INCLUDE)]} { puts -nonewline { Location of "tcl.h": } set opt(tcl_h) [findDir "tcl.h" $headerPath "TCL_VERSION.*$tclv"] if {$opt(tcl_h) == ""} { puts "not found" set success 0 set opt(tcl_h) "$::defaultVar(TCL_INCLUDE)" } else { puts $opt(tcl_h) } } set opt(tcl_lib) "" if {! [info exists var(TCL_LIBRARY)]} { puts -nonewline " Location of Tcl $tclv library: " set opt(tcl_lib) [findDir "libtcl${tclv}.*" $libraryPath] if {$opt(tcl_lib) == ""} { set opt(tcl_lib) [findDir "libtcl${tclv_nodot}.*" $libraryPath] if {$opt(tcl_lib) == ""} { puts "not found" set success 0 set opt(tcl_lib) "$opt(tcl_h)" set opt(tcl_lib_file) "tcl\$(TCL_VERSION)" } else { set opt(tcl_lib_file) "tcl${tclv_nodot}" puts $opt(tcl_lib) } } else { set opt(tcl_lib_file) "tcl\$(TCL_VERSION)" puts $opt(tcl_lib) } } if {! [info exists var(TCL_INCLUDE)]} { set var(TCL_INCLUDE) "-I$opt(tcl_h)" } if {! [info exists var(TCL_LIBRARY)]} { set var(TCL_LIBRARY) "-L$opt(tcl_lib) -l$opt(tcl_lib_file)" } return $success So I guess (And by guess I mean i have no idea how to code) I should write somewhere in here usr/lib/tcl8.5 and usr/lib/tk8.5, am I right?