diff -rup a/src/configure b/src/configure
--- a/src/configure	2020-04-20 21:44:31.000000000 +0200
+++ b/src/configure	2020-05-01 18:04:29.395666444 +0200
@@ -3746,11 +3746,11 @@ fi
 done
 
 
-ac_fn_c_check_header_mongrel "$LINENO" "libpq-fe.h" "ac_cv_header_libpq_fe_h" "$ac_includes_default"
+ac_fn_c_check_header_mongrel "$LINENO" "pgsql/libpq-fe.h" "ac_cv_header_libpq_fe_h" "$ac_includes_default"
 if test "x$ac_cv_header_libpq_fe_h" = xyes; then :
 
 else
-  as_fn_error $? "header file <libpq-fe.h> is required" "$LINENO" 5
+  as_fn_error $? "header file <pgsql/libpq-fe.h> is required" "$LINENO" 5
 fi
 
 
diff -rup a/src/postgres/client.c b/src/postgres/client.c
--- a/src/postgres/client.c	2020-04-20 21:44:31.000000000 +0200
+++ b/src/postgres/client.c	2020-05-01 18:05:20.732221835 +0200
@@ -3,7 +3,7 @@ Postgres Client
 ***********************************************************************************************************************************/
 #include "build.auto.h"
 
-#include <libpq-fe.h>
+#include <pgsql/libpq-fe.h>
 
 #include "common/debug.h"
 #include "common/log.h"