debian/{control,rules}: Build with -DCHANNEL_URBDRC_CLIENT=on only on Linux...

debian/{control,rules}: Build with -DCHANNEL_URBDRC_CLIENT=on only on Linux OSes. (Closes: #815614).

debian/control

@@ -29,8 +29,8 @@ Build-Depends:
  xmlto,
  libavcodec-dev,
  libxi-dev,
- libusb-1.0-0-dev,
- libudev-dev,
+ libusb-1.0-0-dev [linux-any],
+ libudev-dev [linux-any],
  libdbus-glib-1-dev,
  uuid-dev,
 Standards-Version: 3.9.6

debian/rules

@@ -13,6 +13,13 @@ else
 ARM_FLOAT_ABI =
 endif
 
+DEB_BUILD_ARCH_OS=$(shell dpkg-architecture -qDEB_BUILD_ARCH_OS)
+ifneq (,$(filter linux,$(DEB_BUILD_ARCH_OS)))
+LINUX_URBDRC_CLIENT = -DCHANNEL_URBDRC_CLIENT=on
+else
+LINUX_URBDRC_CLIENT = -DCHANNEL_URBDRC_CLIENT=off
+endif
+
 include /usr/share/cdbs/1/class/cmake.mk
 include /usr/share/cdbs/1/rules/debhelper.mk
 include /usr/share/cdbs/1/rules/utils.mk
@@ -31,7 +38,7 @@ DEB_CMAKE_EXTRA_FLAGS :=  -DCMAKE_INSTALL_INCLUDEDIR=include/$(shell dpkg-archit
                           -DWITH_CUPS=on \
                           -DWITH_PCSC=on \
                           -DWITH_JPEG=on \
-                          -DCHANNEL_URBDRC_CLIENT=on \
+                          $(LINUX_URBDRC_CLIENT) \
                           $(ARM_FLOAT_ABI) \
                           $(NULL)