Added paragraph about gcc and GNU make and the C compiler.

Added sentence about GTK_CONFIG. Removed information about
SANE 1.0.1.
Henning Meier-Geinitz <henning@meier-geinitz.de>

INSTALL

@@ -8,6 +8,11 @@ make
 make install        
 
 
+- GNU make version 3.70 or later and an ANSI C-Compiler (e.g. gcc) is needed
+  for compilation. It may be necessary to specify the path to GNU make and the
+  compiler by setting the environment variables MAKE and CC before running
+  configure.
+
 - You must install the sane-backends package before you can configure this
   package. If you use pre-compiled binaries (e.g. from your distribution) you
   will also have to install the SANE headers (maybe in a package called
@@ -15,29 +20,27 @@ make install
 
 - For xscanimage and xcam you need the X Window libraries and headers. 
   Further more GTK version 0.99.13 (or above) must be installed together with 
-  its header files. GTK can be found at http://www.gtk.org/.
+  its header files. GTK can be found at http://www.gtk.org/. For some
+  operating systems it's necessary to set the path to gtk-config explicitely. 
+  This can be done by using the environment variable GTK_CONFIG. For FreeBSD
+  use `GTK_CONFIG=gtk12-config'.
 
 - If you want to use xscanimage as a GIMP plug-in, the GIMP libraries and
   headers are necessary. See http://www.gimp.org/.
 
 - If you get an error message that libsane-dll.so.1 or libsane-so.1 is not
   found, you have to tell your system where the SANE-libraries are installed.
-
-- On some systems the library directory "/usr/local/lib" is not searched by
+  On some systems the library directory "/usr/local/lib" is not searched by
   the system's dynamic library loader. If SANE is installed in "/usr/local/..."
   you have to tell your system's dynamic library loader to search in
   "/usr/local/lib". For Linux: add the path "/usr/local/lib" to
   /etc/ld.so.conf and call ldconfig (as root).
 
-- ONLY for for sane-1.0.1: You have to add a line with the path to the
-  directory containing the SANE libraries (usually /usr/local/lib/sane)
-  to /etc/ld.so.conf and call ldconfig (as root). Don't do this for
-  sane-1.0.2 and later.
-
 See also the PROBLEMS file.
 
 
 Uninstall
 =========
 
-To uninstall the binaries and manual pages, type `make uninstall´.
+To uninstall the binaries and manual pages, type `make uninstall´.
+