diff -pruN kasumi-2.5.orig/configure.in kasumi-2.5/configure.in
--- kasumi-2.5.orig/configure.in 2009-07-13 12:41:26.000000000 +0900
+++ kasumi-2.5/configure.in 2021-03-31 16:59:21.255070350 +0900
@@ -32,8 +32,10 @@ AC_CHECK_LIB(iconv, iconv)
AC_CHECK_LIB(anthydic, anthy_dic_util_init)
AC_CHECK_LIB(anthy, anthy_get_version_string)
-CFLAGS="$CFLAGS -Wall"
-CXXFLAGS="$CXXFLAGS -Wall"
+PKG_CHECK_MODULES(ANTHY, anthy)
+
+CFLAGS="$CFLAGS -Wall $ANTHY_CFLAGS"
+CXXFLAGS="$CXXFLAGS -Wall $ANTHY_CFLAGS"
dnl Checks for header files.