build fix

waveshare/CMakeLists.txt

@@ -10,4 +10,4 @@ set(src
 
 add_library(${target} STATIC ${src})
 target_include_directories(${target} PUBLIC include/)
-target_link_libraries(${target} PRIVATE bcm2835)
+target_link_libraries(${target} PUBLIC bcm2835)

waveshare/include/DEV_Config.h

@@ -48,6 +48,9 @@
 #ifndef _DEV_CONFIG_H_
 #define _DEV_CONFIG_H_
 
+#define RPI
+#define USE_BCM2835_LIB
+
 #include <stdint.h>
 #include <stdio.h>
 #include <unistd.h>