update to enable compiling for Linus and Cygwin

README.wavsim

@@ -26,6 +26,10 @@ http://gareus.org/oss/spicesound/start
 
 A complete package for Windows is available at
 http://ngspice.sourceforge.net/download.html#wav .
-Test on Linux and macOS will follow.
+
+For Linux you have to install libsamplerate and libsndfile and their development headers.
+./compile_linux.sh will then compile and install ngspice with *.wav capability.
+
+Test on macOS will follow.
 
 

configure.ac

@@ -822,6 +822,17 @@ if test "x$with_fftw3" != xno; then
          LIBS="$LIBS -lfftw3"])
 fi
 
+AC_CHECK_HEADERS([sndfile.h])
+AC_CHECK_LIB([sndfile], [sf_command],
+        [AC_DEFINE([HAVE_LIBSNDFILE], [], [Have libsndfile])
+         LIBS="$LIBS -lsndfile"])
+
+AC_CHECK_HEADERS([samplerate.h])
+AC_CHECK_LIB([samplerate], [src_process],
+        [AC_DEFINE([HAVE_LIBSAMPLERATE], [], [Have libsamplerate])
+         LIBS="$LIBS -lsamplerate"])
+
+
 # Check for a few mathematical functions:
 AC_CHECK_FUNCS([erfc logb scalb scalbn asinh acosh atanh finite])
 # According POSIX we should look for macros first

src/frontend/sndprint.c

@@ -1,6 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
-#include "..\src\misc\getopt_bsd.h"
+#include "../misc/getopt_bsd.h"
 #include <sndfile.h>
 #include <string.h>
 #include <math.h>