Down to the point: Just in the case of someone trying to compile or run Projucer on Linux (at least on a Debian distro) and finding that the file “libcurl.pc” is not found, I got to a solution by installing the package libcurl4-openssl-dev from repos, and after that it just compiled and ran smoothly. Later, I launched the Projucer and opened a couple of the demos. To compile and build one has just to click on “save project” and the Projucer will write the makefile (as “Makefile”) in the directory /Builds/LinuxMakeFile. The excecutable will be placed in the directory /Builds/LinuxMakeFile/build, created upon compilation.
I am a starter in JUCE, and I have just a few hours in C++ programming. I am delighted with this framework by now. Thanks to everyone sharing knowledge.