pass install prefix to proxychains app, to find /etc

Makefile

@@ -33,7 +33,7 @@ ALL_TOOLS = $(PXCHAINS)
 -include config.mak
 
 CFLAGS+=$(USER_CFLAGS)
-CFLAGS_MAIN=-DLIB_DIR=\"$(libdir)\"
+CFLAGS_MAIN=-DLIB_DIR=\"$(libdir)\" -DINSTALL_PREFIX=\"$(prefix)\"
 
 
 all: $(ALL_LIBS) $(ALL_TOOLS)

src/main.c

@@ -121,7 +121,13 @@ int main(int argc, char *argv[]) {
 		if(check_path(path))
 			goto have;
 
-		// priority 4: /etc/proxychains.conf
+		// priority 4: $INSTALL_PREFIX/etc/proxychains.conf
+		snprintf(pbuf, sizeof(pbuf), "%s/%s", INSTALL_PREFIX, PROXYCHAINS_CONF_FILE);
+		path = pbuf;
+		if(check_path(path))
+			goto have;
+
+		// priority 5: /etc/proxychains.conf
 		path = "/etc/proxychains.conf";
 		if(check_path(path))
 			goto have;