Only build hardware drivers if they're enabled.

hardware/asix-sigma/Makefile.am

@@ -17,6 +17,8 @@
 ## along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ##
 
+if LA_ASIX_SIGMA
+
 AM_CPPFLAGS = -DFIRMWARE_DIR='"$(FIRMWARE_DIR)"'
 
 # Local lib, this is NOT meant to be installed!
@@ -29,3 +31,5 @@ libsigrokhwasixsigma_la_SOURCES = \
 libsigrokhwasixsigma_la_CFLAGS = \
 	-I$(top_srcdir)/libsigrok
 
+endif
+

hardware/openbench-logic-sniffer/Makefile.am

@@ -17,6 +17,8 @@
 ## along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ##
 
+if LA_OLS 
+
 # Local lib, this is NOT meant to be installed!
 noinst_LTLIBRARIES = libsigrokhwols.la
 
@@ -26,3 +28,4 @@ libsigrokhwols_la_SOURCES = \
 libsigrokhwols_la_CFLAGS = \
 	-I$(top_srcdir)/libsigrok
 
+endif

hardware/saleae-logic/Makefile.am

@@ -17,6 +17,8 @@
 ## along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ##
 
+if LA_SALEAE_LOGIC
+
 AM_CPPFLAGS = -DFIRMWARE_DIR='"$(FIRMWARE_DIR)"'
 
 # Local lib, this is NOT meant to be installed!
@@ -28,3 +30,5 @@ libsigrokhwsaleaelogic_la_SOURCES = \
 libsigrokhwsaleaelogic_la_CFLAGS = \
 	-I$(top_srcdir)/libsigrok
 
+endif
+

hardware/zeroplus-logic-cube/Makefile.am

@@ -17,6 +17,8 @@
 ## along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ##
 
+if LA_ZEROPLUS_LOGIC_CUBE
+
 # Local lib, this is NOT meant to be installed!
 noinst_LTLIBRARIES = libsigrokhwzeroplus.la
 
@@ -30,3 +32,5 @@ libsigrokhwzeroplus_la_SOURCES = \
 libsigrokhwzeroplus_la_CFLAGS = \
 	-I$(top_srcdir)/libsigrok
 
+endif
+