Update INSTALL.txt

Author: katjav

INSTALL.txt

@@ -1,26 +1,19 @@
 Quick compilation instructions for Linux or Mac OSX:
 
-There are two parallel build systems: the "old" one by Miller and the "new"
-one by Hans.
+In this directory, type "./autogen.sh". This will create the configure script.
 
-Old build system: on Macintosh or linux, Change to "src" subdirectory.
-Type "./configure", possibly adding flags as follows:
+Then type "./configure", possibly adding flags as follows:
 
     To put Pd in /usr/bin instead of /usr/local/bin, add "--prefix=/bin".
-    To enable jack support: "--enable-jack"
+    To put Pd in this directory, add "--prefix=/path/to/this/directory" (fill your path here).
+    To enable jack support: "--enable-jack".
+    To force a single precision build, add "--disable-double-precision".
+    To force a double precision build, add "--enable-double-precision".
 
-Then type "make"; and. if desired, as superuser type "make install".
+Then type "make"; and if desired, as superuser type "make install".
 
 To run pd, either type the full pathname as in /home/me/pd/bin/pd, or else
-if you've chosen  "make install", just type "pd".
-
-New build system: in this directory, type "./autogen.sh", then "./configure";
-then "make".
-
-Special instructions for Microsoft Windows: to use the old build system,
-install the Microsoft C compiler, cd to src and type "make -f makefile.nt". 
-Then CD to the various subdirs of extra and type "make nt" in each.  For the
-new build system, install cygwin and follow instructions as in linux or
-Macintosh.
-
+if pd is installed in /usr/bin or /usr/local/bin, just type "pd".
 
+Special instructions for Microsoft Windows: install cygwin and follow instructions as in linux or
+Macintosh.