Add BSDmakefile with a note to run 'gmake' for BSD users.

Also, check for GNU make (which can be either 'make' or 'gmake')
early in ./Config and print out an error to install prerequisites
from https://www.unrealircd.org/docs/Installing_from_source

This also replaces 'make' with ${MAKE} (and such) everywhere.

BSDmakefile

@@ -0,0 +1,4 @@
+.DONE:
+	@echo "Please use GNU Make (gmake) to build UnrealIRCd"
+.DEFAULT:
+	@echo "Please use GNU Make (gmake) to build UnrealIRCd"

Config

@@ -158,7 +158,7 @@ if [ "$QUICK" != "1" ] ; then
 			echo "*******************************************************************************"
 			echo "Press ENTER to continue"
 			read cc
-			make pem
+			$MAKE pem
 			echo "Certificate created successfully."
 			sleep 1
 		else
@@ -173,7 +173,7 @@ fi
 # Silently force a 'make clean' as otherwise part (or whole) of the
 # compiled source could be using different settings than the user
 # just requested when re-running ./Config.
-make clean 1>/dev/null 2>&1
+$MAKE clean 1>/dev/null 2>&1
 }
 
 RUN_ADVANCED () {
@@ -333,6 +333,33 @@ if [ "`id -u`" = "0" ]; then
 	exit
 fi
 
+# Check for gmake early...
+if [ "$MAKE" = "" ]; then
+	MAKE="make"
+fi
+
+if ! $MAKE --version 2>&1|grep -q "GNU Make"; then
+	# So $MAKE is not GNU make, but do we have gmake?
+	if gmake --version 2>&1|grep -q "GNU Make"; then
+		# Great, use that one!
+		MAKE="gmake"
+	else
+		# Both $MAKE and gmake are not GNU make, do we have a working $MAKE at all?
+		if $MAKE --version 1>/dev/null 2>&1; then
+			echo "Your system has 'make' but UnrealIRCd requires GNU Make ('gmake')"
+			echo "Please install 'gmake' (eg 'pkg install gmake' on BSD)."
+			exit 1
+		else
+			echo "Your system does not have the required tools installed to build UnrealIRCd."
+			echo "Please check https://www.unrealircd.org/docs/Installing_from_source"
+			echo "and install the required tools listed under 'Prerequisites'."
+			echo "After that, you can run ./Config again"
+			exit 1
+		fi
+	fi
+fi
+
+
 clear
 
 if [ -f "doc/Config.header" -a -z "$NOINTRO" ] ; then
@@ -808,7 +835,7 @@ cat << __EOF__
 |_______________________________________________________________________|
 |_______________________________________________________________________|
 |                                                                       |
-| Now all you have to do is type 'make' and let it compile. When that's |
+| Now all you have to do is type '$MAKE' and let it compile. When that's |
 | done, you will receive other instructions on what to do next.         |
 |                                                                       |
 |_______________________________________________________________________|

Makefile.in

@@ -148,7 +148,7 @@ build: Makefile
 	done
 	@echo ''
 	@echo '* UnrealIRCd compiled successfully'
-	@echo '* YOU ARE NOT DONE YET! Run "make install" to install UnrealIRCd !'
+	@echo '* YOU ARE NOT DONE YET! Run "${MAKE} install" to install UnrealIRCd !'
 	@echo ''
 
 clean:

src/Makefile.in

@@ -88,7 +88,7 @@ version.c: version.c.SH
 
 clean:
 	$(RM) -f *.o *.so *~ core ircd version.c; \
-	cd modules; make clean
+	cd modules; ${MAKE} clean
 
 cleandir: clean
 

src/buildmod

@@ -1,4 +1,5 @@
 #!/bin/sh
+MAKE="$1"
 echo ""
 echo "Checking for updates for third party modules..."
 # We can't use the "unrealircd" script, since possibly the ircd
@@ -13,7 +14,7 @@ if [ "$x" != "*.c" ]; then
 	x="`echo $x|sed 's/\.c//'`"
 	if [ ! -f $x.so -o $x.c -nt $x.so ]; then
 		echo "Building 3rd party module $x..."
-		make custommodule MODULEFILE=$x || (echo "*****"; echo "Building 3rd party module $x failed."; echo "Contact the module author of the $x module (not the UnrealIRCd team), or simply delete the $PWD/$x.c file"; echo "*****"; exit 1)
+		$MAKE custommodule MODULEFILE=$x || (echo "*****"; echo "Building 3rd party module $x failed."; echo "Contact the module author of the $x module (not the UnrealIRCd team), or simply delete the $PWD/$x.c file"; echo "*****"; exit 1)
 	fi
 fi
 done

src/modules/third/Makefile.in

@@ -40,7 +40,7 @@ RM=@RM@
 all: build
 
 build:
-	../../buildmod
+	../../buildmod $(MAKE)
 
 custommodule: $(MODULEFILE).c
 	$(CC) $(CFLAGS) $(MODULEFLAGS) -DDYNAMIC_LINKING \