fix debian builds

issue described: https://github.com/SoftEtherVPN/SoftEtherVPN/issues/550

configure

@@ -21,7 +21,12 @@ if [ ! -d "tmp" ]; then
   mkdir tmp
 fi
 
-(cd tmp && cmake .. || exit 1)
+if [ ! -z ${CMAKE_INSTALL_PREFIX+x} ]; then
+	CMAKE_FLAGS="-DCMAKE_INSTALL_PREFIX=${CMAKE_INSTALL_PREFIX}"
+fi
+
+(cd tmp && cmake ${CMAKE_FLAGS} .. || exit 1)
+
 
 echo ""
 

debian/rules

@@ -1,6 +1,7 @@
 #!/usr/bin/make -f
 
 export DH_VERBOSE=1
+export CMAKE_INSTALL_PREFIX=`pwd`/../../usr
 CFLAGS := $(shell dpkg-buildflags --get CFLAGS)
 LDFLAGS := $(shell dpkg-buildflags --get LDFLAGS)
 
@@ -9,13 +10,14 @@ LDFLAGS := $(shell dpkg-buildflags --get LDFLAGS)
 
 override_dh_auto_configure: configure_config
 
+override_dh_auto_make:
+	make -C tmp
+
 override_dh_auto_clean:
 	rm -fr Makefile* usr bin tmp src/bin/BuiltHamcoreFiles
 
 override_dh_auto_install:
-	patch -f < debian/makefile.patch
-	mkdir -p usr/bin
-	make install
+	make -C tmp install
 
 configure_config:
 	if [ $(shell uname -m) = 'x86_64' ]; then echo -e "1\n2\n" | ./configure; fi

debian/softether-vpnbridge.install

@@ -1,3 +1,3 @@
 #! /usr/bin/dh-exec
 debian/bin/vpnbridge usr/bin/
-usr/vpnbridge opt/
+usr/bin/vpnbridge opt/

debian/softether-vpnclient.install

@@ -1,3 +1,3 @@
 #! /usr/bin/dh-exec
 debian/bin/vpnclient usr/bin/
-usr/vpnclient opt/
+usr/bin/vpnclient opt/

debian/softether-vpncmd.install

@@ -1,3 +1,3 @@
 #! /usr/bin/dh-exec
 debian/bin/vpncmd usr/bin/
-usr/vpncmd opt/
+usr/bin/vpncmd opt/

debian/softether-vpnserver.install

@@ -1,3 +1,3 @@
 #! /usr/bin/dh-exec
 debian/bin/vpnserver usr/bin/
-usr/vpnserver opt/
+usr/bin/vpnserver opt/