--- a/ruby/curia/extconf.rb
+++ b/ruby/curia/extconf.rb
@@ -2,10 +2,9 @@
 
 dir_config("curia")
 
-home = ENV['HOME']
-$CFLAGS = "-I. -I../.. -I#{home}/include -I/usr/local/include"
-$LDFLAGS = "-L../.. -L#{home}/lib -L/usr/local/lib"
-$LIBS = "-L../.. -L#{home}/lib -L/usr/local/lib"
+$CFLAGS  << " -I../.. " << ENV["CFLAGS"]
+$LDFLAGS << " -L../.. " << ENV["LDFLAGS"]
+$LIBS    << " -L../.."
 
 have_library("c", "main")
 have_library("pthread", "main")
--- a/ruby/curia/mod_curia.c
+++ b/ruby/curia/mod_curia.c
@@ -84,7 +84,7 @@
  *************************************************************************************************/
 
 
-Init_mod_curia(){
+void Init_mod_curia(void){
   crinit();
   ccuriaerror = rb_define_class("CuriaError", rb_eStandardError);
   ccuriaerror_ENOERR = rb_define_class("CuriaError_ENOERR", ccuriaerror);
--- a/ruby/depot/extconf.rb
+++ b/ruby/depot/extconf.rb
@@ -2,10 +2,9 @@
 
 dir_config("depot")
 
-home = ENV['HOME']
-$CFLAGS = "-I. -I../.. -I#{home}/include -I/usr/local/include"
-$LDFLAGS = "-L../.. -L#{home}/lib -L/usr/local/lib"
-$LIBS = "-L../.. -L#{home}/lib -L/usr/local/lib"
+$CFLAGS  << " -I../.. " << ENV["CFLAGS"]
+$LDFLAGS << " -L../.. " << ENV["LDFLAGS"]
+$LIBS    << " -L../.."
 
 have_library("c", "main")
 have_library("pthread", "main")
--- a/ruby/depot/mod_depot.c
+++ b/ruby/depot/mod_depot.c
@@ -83,7 +83,7 @@
  *************************************************************************************************/
 
 
-Init_mod_depot(){
+void Init_mod_depot(void){
   dpinit();
   cdepoterror = rb_define_class("DepotError", rb_eStandardError);
   cdepoterror_ENOERR = rb_define_class("DepotError_ENOERR", cdepoterror);
--- a/ruby/villa/extconf.rb
+++ b/ruby/villa/extconf.rb
@@ -2,10 +2,9 @@
 
 dir_config("villa")
 
-home = ENV['HOME']
-$CFLAGS = "-I. -I../.. -I#{home}/include -I/usr/local/include"
-$LDFLAGS = "-L../.. -L#{home}/lib -L/usr/local/lib"
-$LIBS = "-L../.. -L#{home}/lib -L/usr/local/lib"
+$CFLAGS  << " -I../.. " << ENV["CFLAGS"]
+$LDFLAGS << " -L../.. " << ENV["LDFLAGS"]
+$LIBS    << " -L../.."
 
 have_library("c", "main")
 have_library("pthread", "main")
--- a/ruby/villa/mod_villa.c
+++ b/ruby/villa/mod_villa.c
@@ -97,7 +97,7 @@
  *************************************************************************************************/
 
 
-Init_mod_villa(){
+void Init_mod_villa(void){
   vlinit();
   cvillaerror = rb_define_class("VillaError", rb_eStandardError);
   cvillaerror_ENOERR = rb_define_class("VillaError_ENOERR", cvillaerror);