portability: gmake vs make

Hi Rodrigo, 

Looking at your recent commit:

>Make Dillo strictly C99, C++11 and POSIX-2001 compliant, without
>depending on GNU extensions.

Right now the OpenBSD port of Dillo is dependent on gmake (GNU make) to
build the package. 

Out of curiosity, I tried to use the native 'make' command:

$ make

[...]
Making all in doc
Using $< in a non-suffix rule context is a GNUmake idiom (Makefile:556)
*** Error 1 in . (Makefile:583 'all-recursive')
*** Error 2 in . (Makefile:380 'all')

Everything else builds fine, except this error in doc. 

Here is the offending line:

$ diff -up a/doc/Makefile.am b/doc/Makefile.am           
--- a/doc/Makefile.am Sun Aug 11 00:01:58 2024
+++ b/doc/Makefile.am Sun Aug 11 00:01:51 2024
@@ -11,6 +11,6 @@ dillo.1: $(srcdir)/dillo.1.in Makefile
 
 # Use .in.html instead of .html.in so it is recognized as HTML.
 user_help.html: $(srcdir)/user_help.in.html Makefile
-       sed 's/__VERSION__/${VERSION}/g' $< > $@
 
 DISTCLEANFILES = dillo.1 user_help.html


With that removed, there are no errors. 

Regards,
Alex
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