--- configure.ac.orig	2019-08-28 05:40:03 UTC
+++ configure.ac
@@ -57,9 +57,9 @@ AC_ARG_WITH([cupsfilterdir],
 if test "xno" = "x${with_cupsfilterdir}"; then
    if test "xyes" = "x$have_cups_config" ; then
       dnl `@<:@' , `@:>@' are replaced with  `[' , `]'
-      CUPS_FILTER_DIR="${cups_default_prefix}`cups-config --serverbin | sed -e 's,^/@<:@^/@:>@@<:@^/@:>@*,,'`/filter"
+      CUPS_FILTER_DIR=`cups-config --serverbin`"/filter"
    else
-      CUPS_FILTER_DIR="${cups_default_prefix}/lib/cups/filter"
+      AC_MSG_ERROR([CUPS_FILTER_DIR could not be found.])
    fi
 else
    CUPS_FILTER_DIR="${with_cupsfilterdir}"
@@ -71,13 +71,11 @@ AC_ARG_WITH([cupsppddir],
   [],
   [with_cupsppddir=no])
 if test "xno" = "x${with_cupsppddir}"; then
-   if test -d "${cups_default_prefix}/share/ppd" ; then
-      CUPS_PPD_DIR="${cups_default_prefix}/share/ppd"
-   elif test "xyes" = "x$have_cups_config" ; then
+   if test "xyes" = "x$have_cups_config" ; then
       dnl `@<:@' , `@:>@' are replaced with  `[' , `]'
-      CUPS_PPD_DIR="${cups_default_prefix}`cups-config --datadir | sed -e 's,^/@<:@^/@:>@@<:@^/@:>@*,,'`/model"
+      CUPS_PPD_DIR=`cups-config --datadir`"/model"
    else
-      CUPS_PPD_DIR="${cups_default_prefix}/share/cups/model"
+      AC_MSG_ERROR([CUPS_PPD_DIR could not be found.])
    fi
 else
    CUPS_PPD_DIR="${with_cupsppddir}"
@@ -108,6 +106,16 @@ AC_ARG_WITH([internal],
 AC_SUBST([INTERNAL_PPD])
 AC_SUBST([INTERNAL_PPD_OPTION])
 
+if test "xyes" = "x$have_cups_config" ; then
+	CUPS_CPPFLAGS=`cups-config --cflags`
+	CUPS_LDFLAGS=`cups-config --ldflags`
+else
+	CUPS_CPPFLAGS=
+	CUPS_LDFLAGS=
+fi
+AC_SUBST(CUPS_CPPFLAGS)
+AC_SUBST(CUPS_LDFLAGS)
+
 dnl Checks for header files.
 AC_HEADER_STDC
 AC_HEADER_STAT
@@ -115,17 +123,23 @@ AC_HEADER_TIME
 AC_STRUCT_TM
 AC_TYPE_PID_T
 AC_TYPE_SIZE_T
+AC_TYPE_SSIZE_T
 
+old_CPPFLAGS="$CPPFLAGS"
+CPPFLAGS="$CUPS_CPPFLAGS $CPPFLAGS"
+
 AC_CHECK_HEADERS([\
         cups/cups.h \
         cups/ppd.h \
         cups/raster.h \
         ])
+
+CPPFLAGS="$old_CPPFLAGS"
+
 AC_CHECK_HEADERS([\
         ctype.h \
         errno.h \
         fcntl.h \
-        malloc.h \
         signal.h \
         stdarg.h \
         stddef.h \
@@ -136,21 +150,45 @@ AC_CHECK_HEADERS([\
         time.h \
         unistd.h \
         ])
+AC_CHECK_HEADERS([\
+        sys/ioctl.h \
+        sys/time.h \
+        termios.h \
+        ])
 
-# Checks for libraries.
-AC_CHECK_LIB([cups], [ppdOpenFile])
-AC_CHECK_LIB([cupsimage], [cupsRasterOpen])
-
 # Checks for library functions.
 #AC_FUNC_MALLOC avoiding rpl_malloc stupidness
 AC_FUNC_MEMCMP
-AC_TYPE_SIGNAL
+#AC_TYPE_SIGNAL
 AC_CHECK_FUNCS([\
         memset \
         strcspn \
         strerror \
         strrchr \
         ])
+AC_CHECK_FUNCS([\
+        atexit \
+        malloc \
+        memmove \
+        realloc \
+        select \
+        strchr \
+        strstr \
+        ])
+
+# Checks for libraries.
+AC_CHECK_LIB([pthread], [pthread_create])
+
+old_CPPFLAGS="$CPPFLAGS"
+CPPFLAGS="$CUPS_CPPFLAGS $CPPFLAGS"
+old_LDFLAGS="$LDFLAGS"
+LDFLAGS="$CUPS_LDFLAGS $LDFLAGS"
+
+AC_CHECK_LIB([cups], [ppdOpenFile])
+AC_CHECK_LIB([cupsimage], [cupsRasterOpen])
+
+LDFLAGS="$old_LDFLAGS"
+CPPFLAGS="$old_CPPFLAGS"
 
 AC_CONFIG_FILES([\
         Makefile \