add FIND_NIFTI

looks for libniftiio

configure.ac

@@ -842,6 +842,19 @@ if test x"$with_OpenEXR" != x"no"; then
   )
 fi
 
+# nifti
+AC_ARG_WITH([nifti],
+  AS_HELP_STRING([--without-nifti], [build without nifti (default: test)]))
+
+if test x"$with_nifti" != x"no"; then
+  FIND_NIFTI([
+     with_nifti=yes
+    ],[
+     with_nifti=no
+    ]
+  )
+fi
+
 # pdfium
 AC_ARG_WITH([pdfium],
   AS_HELP_STRING([--without-pdfium], [build without pdfium (default: test)]))
@@ -1375,6 +1388,7 @@ save with libMagick: 			$enable_magicksave
 accelerate loops with orc: 		$with_orc
   (requires orc-0.4.11 or later)
 ICC profile support with lcms: 		$with_lcms
+file import with niftiio: 		$with_nifti
 file import with OpenEXR: 		$with_OpenEXR
 file import with OpenSlide:		$with_openslide
   (requires openslide-3.3.0 or later)

m4/nifti.m4

@@ -0,0 +1,119 @@
+dnl From FIND_MOTIF and ACX_PTHREAD, without much understanding
+dnl
+dnl FIND_NIFTI[ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]]
+dnl ------------------------------------------------
+dnl
+dnl Find NIFTI libraries and headers
+dnl
+dnl Put compile stuff in NIFTI_INCLUDES
+dnl Put link stuff in NIFTI_LIBS
+dnl Define HAVE_NIFTI if found
+dnl
+AC_DEFUN([FIND_NIFTI], [
+AC_REQUIRE([AC_PATH_XTRA])
+
+NIFTI_INCLUDES=""
+NIFTI_LIBS=""
+
+AC_ARG_WITH(nifti, 
+  AS_HELP_STRING([--without-nifti], [build without nifti (default: test)]))
+# Treat --without-nifti like --without-nifti-includes --without-nifti-libraries.
+if test "$with_nifti" = "no"; then
+  NIFTI_INCLUDES=no
+  NIFTI_LIBS=no
+fi
+
+AC_ARG_WITH(nifti-includes,
+  AS_HELP_STRING([--with-nifti-includes=DIR], [libnifti includes are in DIR]),
+  NIFTI_INCLUDES="-I$withval")
+AC_ARG_WITH(nifti-libraries,
+  AS_HELP_STRING([--with-nifti-libraries=DIR], [libnifti libraries are in DIR]),
+  NIFTI_LIBS="-L$withval -lnifti")
+
+AC_MSG_CHECKING(for NIFTI)
+
+# Look for nifti1_io.h ... usually in /usr/include/nifti
+if test "$NIFTI_INCLUDES" = ""; then
+  nifti_save_CFLAGS="$CFLAGS"
+
+  # annoyingly, the header must be unqualified, so we have to add to the
+  # search path
+  CFLAGS="-I/usr/include/nifti $nifti_save_CFLAGS"
+
+  AC_TRY_COMPILE([#include <nifti1_io.h>],[int a;],[
+    NIFTI_INCLUDES="-I/usr/include/nifti"
+  ], [
+    # not in the standard search path, try $prefix
+    CFLAGS="-I${prefix}/include/nifti $nifti_save_CFLAGS"
+
+    AC_TRY_COMPILE([#include <nifti1_io.h>],[int a;],[
+      NIFTI_INCLUDES="-I${prefix}/include/nifti"
+    ], [
+      NIFTI_INCLUDES="no"
+    ])
+  ])
+
+  CFLAGS="$nifti_save_CFLAGS"
+fi
+
+# Now for the libraries
+if test "$NIFTI_LIBS" = ""; then
+  nifti_save_LIBS="$LIBS"
+  nifti_save_CFLAGS="$CFLAGS"
+
+  LIBS="-lniftiio -lm $nifti_save_LIBS"
+  CFLAGS="$NIFTI_INCLUDES $CFLAGS"
+
+  # Try the standard search path first
+  AC_TRY_LINK([#include <nifti1_io.h>],[is_nifti_file("")], [
+    NIFTI_LIBS="-lniftiio"
+  ], [
+    # libniftiio is not in the standard search path, try $prefix
+
+    LIBS="-L${prefix}/lib $LIBS"
+
+    AC_TRY_LINK([#include <nifti1_io.h>],[is_nifti_file("")], [
+      NIFTI_LIBS="-L${prefix}/lib -lniftiio"
+    ], [
+      NIFTI_LIBS=no
+    ])
+  ])
+
+  LIBS="$nifti_save_LIBS"
+  CFLAGS="$nifti_save_CFLAGS"
+fi
+
+AC_SUBST(NIFTI_LIBS)
+AC_SUBST(NIFTI_INCLUDES)
+
+# Print a helpful message
+nifti_libraries_result="$NIFTI_LIBS"
+nifti_includes_result="$NIFTI_INCLUDES"
+
+if test x"$nifti_libraries_result" = x""; then
+  nifti_libraries_result="in default path"
+fi
+if test x"$nifti_includes_result" = x""; then
+  nifti_includes_result="in default path"
+fi
+
+if test "$nifti_libraries_result" = "no"; then
+  nifti_libraries_result="(none)"
+fi
+if test "$nifti_includes_result" = "no"; then
+  nifti_includes_result="(none)"
+fi
+
+AC_MSG_RESULT([libraries $nifti_libraries_result, headers $nifti_includes_result])
+
+# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
+if test "$NIFTI_INCLUDES" != "no" && test "$NIFTI_LIBS" != "no"; then
+  AC_DEFINE(HAVE_NIFTI,1,[Define if you have nifti libraries and header files.])
+  $1
+else
+  NIFTI_INCLUDES=""
+  NIFTI_LIBS=""
+  $2
+fi
+
+])dnl