--- a/acsidplay.m4	Tue Jun 03 11:19:04 2003 +0000
+++ b/acsidplay.m4	Tue Jun 03 11:25:05 2003 +0000
@@ -1,4 +1,10 @@
-# sidplay.m4  sidplay checks
+# sidplay.m4 - libSIDPlay 1.xx.xx checks
+# Originally by Michael Schwendt
+# Modified by Matti 'ccr' Hamalainen
+
+dnl -------------------------------------------------------------------------
+dnl Try to find a file (or one of more files in a list of dirs).
+dnl -------------------------------------------------------------------------
 
 AC_DEFUN(AC_FIND_FILE,
     [
@@ -16,6 +22,10 @@
     ]
 )
 
+
+dnl -------------------------------------------------------------------------
+dnl Try to find SIDPLAY includes and library.
+dnl -------------------------------------------------------------------------
 AC_DEFUN(AC_PATH_LIBSIDPLAY,
 [
 AC_MSG_CHECKING([for SIDPLAY includes and library])
@@ -46,7 +56,8 @@
   ])
 
 if test "$ac_sidplay_cflags" = NO || test "$ac_sidplay_library" = NO; then
-#search common locations
+
+# Search common locations
 
 AC_CACHE_VAL(ac_cv_have_sidplay,
 [
@@ -99,8 +110,10 @@
   all_includes="$SIDPLAY_CFLAGS $all_includes"
 fi
 
-dnl Test compilation.
 
+dnl ***
+dnl *** Test compilation
+dnl ***
 AC_MSG_CHECKING([whether -lsidplay works])
 ac_cxxflags_safe=$CXXFLAGS
 ac_ldflags_safe=$LDFLAGS
@@ -129,7 +142,10 @@
   have_sidplay=no
 fi
 
-dnl
+
+dnl ***
+dnl *** Substitute variables
+dnl ***
 
 AC_SUBST(SIDPLAY_CFLAGS)
 AC_SUBST(SIDPLAY_LIBS)