--- configure.ac.old	2019-09-03 09:58:34.566700370 +0100
+++ configure.ac	2019-09-03 09:58:42.465991559 +0100
@@ -217,7 +217,6 @@
   [--enable-proj], [enables PROJ.4 inclusion [default=yes]])],
   [], [enable_proj=yes])
 if test x"$enable_proj" != "xno"; then
-  AC_CHECK_HEADERS(proj_api.h,, [AC_MSG_ERROR([cannot find proj_api.h, bailing out])])
   AC_SEARCH_LIBS(pj_init_plus,proj,,AC_MSG_ERROR(['libproj' is required but it doesn't seem to be installed on this system.]),-lm)
   AC_SEARCH_LIBS(pj_init_ctx,proj,,AC_MSG_ERROR(['libproj' is required but the version on this system does not support the required features (Version 4.8.0 or later is needed).]),-lm)
 else