diff --git a/open_esplibs/component.mk b/open_esplibs/component.mk
index 26fa5ad..23c8b6a 100644
--- a/open_esplibs/component.mk
+++ b/open_esplibs/component.mk
@@ -1,11 +1,15 @@
-# Component makefile for "open sdk libs"
+# Component makefile for "open Espressif libs"
+
+INC_DIRS += $(open_esplibs_ROOT)include
+
+$(eval $(call component_compile_rules,open_esplibs))
 
 # args for passing into compile rule generation
-opensdk_libmain_ROOT = $(opensdk_libmain_DEFAULT_ROOT)libmain
-opensdk_libmain_INC_DIR = 
-opensdk_libmain_SRC_DIR = $(opensdk_libmain_ROOT)
-opensdk_libmain_EXTRA_SRC_FILES = 
+open_esplibs_libmain_ROOT = $(open_esplibs_libmain_DEFAULT_ROOT)libmain
+open_esplibs_libmain_INC_DIR = 
+open_esplibs_libmain_SRC_DIR = $(open_esplibs_libmain_ROOT)
+open_esplibs_libmain_EXTRA_SRC_FILES = 
 
-opensdk_libmain_CFLAGS = $(CFLAGS)
+open_esplibs_libmain_CFLAGS = $(CFLAGS)
 
-$(eval $(call component_compile_rules,opensdk_libmain))
+$(eval $(call component_compile_rules,open_esplibs_libmain))
diff --git a/open_esplibs/include/open_esplibs.h b/open_esplibs/include/open_esplibs.h
new file mode 100644
index 0000000..5443fef
--- /dev/null
+++ b/open_esplibs/include/open_esplibs.h
@@ -0,0 +1,36 @@
+#ifndef _OPEN_ESPLIBS_H
+#define _OPEN_ESPLIBS_H
+
+// This header includes conditional defines to control which bits of the
+// Open-Source libraries get built when building esp-open-rtos.  This can be
+// useful for quickly troubleshooting whether a bug is due to the
+// reimplementation of Espressif libraries, or something else.
+
+#ifndef OPEN_ESPLIBS
+#define OPEN_ESPLIBS 1
+#endif
+
+#ifndef OPEN_LIBMAIN
+#define OPEN_LIBMAIN (OPEN_ESPLIBS)
+#endif
+
+#ifndef OPEN_LIBMAIN_MISC
+#define OPEN_LIBMAIN_MISC (OPEN_LIBMAIN)
+#endif
+#ifndef OPEN_LIBMAIN_OS_CPU_A
+#define OPEN_LIBMAIN_OS_CPU_A (OPEN_LIBMAIN)
+#endif
+#ifndef OPEN_LIBMAIN_SPI_FLASH
+#define OPEN_LIBMAIN_SPI_FLASH (OPEN_LIBMAIN)
+#endif
+#ifndef OPEN_LIBMAIN_TIMERS
+#define OPEN_LIBMAIN_TIMERS (OPEN_LIBMAIN)
+#endif
+#ifndef OPEN_LIBMAIN_UART
+#define OPEN_LIBMAIN_UART (OPEN_LIBMAIN)
+#endif
+#ifndef OPEN_LIBMAIN_XTENSA_CONTEXT
+#define OPEN_LIBMAIN_XTENSA_CONTEXT (OPEN_LIBMAIN)
+#endif
+
+#endif /* _OPEN_ESPLIBS_H */
diff --git a/open_esplibs/libmain/misc.c b/open_esplibs/libmain/misc.c
index 8973f82..3c1cd02 100644
--- a/open_esplibs/libmain/misc.c
+++ b/open_esplibs/libmain/misc.c
@@ -1,3 +1,7 @@
+#include "open_esplibs.h"
+#if OPEN_LIBMAIN_MISC
+// The contents of this file are only built if OPEN_LIBMAIN_MISC is set to true
+
 #include "espressif/esp_misc.h"
 #include "esp/gpio_regs.h"
 #include "esp/rtc_regs.h"
@@ -57,3 +61,5 @@ uint8_t sdk_rtc_get_reset_reason(void) {
     RTC.RESET_REASON0 &= ~RTC_RESET_REASON0_BIT21;
     return reason;
 }
+
+#endif /* OPEN_LIBMAIN_MISC */
diff --git a/open_esplibs/libmain/os_cpu_a.c b/open_esplibs/libmain/os_cpu_a.c
index 4841ebe..7908b6f 100644
--- a/open_esplibs/libmain/os_cpu_a.c
+++ b/open_esplibs/libmain/os_cpu_a.c
@@ -1,3 +1,7 @@
+#include "open_esplibs.h"
+#if OPEN_LIBMAIN_OS_CPU_A
+// The contents of this file are only built if OPEN_LIBMAIN_OS_CPU_A is set to true
+
 #include "esp/types.h"
 #include "FreeRTOS.h"
 #include "task.h"
@@ -119,3 +123,4 @@ void IRAM sdk__xt_clear_ints(uint32_t mask) {
     WSR(mask, intclear);
 }
 
+#endif /* OPEN_LIBMAIN_OS_CPU_A */
diff --git a/open_esplibs/libmain/spi_flash.c b/open_esplibs/libmain/spi_flash.c
index 2915c79..ee2d2f4 100644
--- a/open_esplibs/libmain/spi_flash.c
+++ b/open_esplibs/libmain/spi_flash.c
@@ -1,3 +1,7 @@
+#include "open_esplibs.h"
+#if OPEN_LIBMAIN_SPI_FLASH
+// The contents of this file are only built if OPEN_LIBMAIN_SPI_FLASH is set to true
+
 #include "FreeRTOS.h"
 #include "common_macros.h"
 #include "esp/spi_regs.h"
@@ -181,3 +185,4 @@ sdk_SpiFlashOpResult IRAM sdk_spi_flash_read(uint32_t src_addr, uint32_t *des_ad
     return result;
 }
 
+#endif /* OPEN_LIBMAIN_SPI_FLASH */
diff --git a/open_esplibs/libmain/timers.c b/open_esplibs/libmain/timers.c
index 1e2a920..d460088 100644
--- a/open_esplibs/libmain/timers.c
+++ b/open_esplibs/libmain/timers.c
@@ -1,3 +1,7 @@
+#include "open_esplibs.h"
+#if OPEN_LIBMAIN_TIMERS
+// The contents of this file are only built if OPEN_LIBMAIN_TIMERS is set to true
+
 #include "etstimer.h"
 #include "stdio.h"
 
@@ -88,3 +92,4 @@ void sdk_os_timer_disarm(ETSTimer *ptimer) {
     }
 }
 
+#endif /* OPEN_LIBMAIN_TIMERS */
diff --git a/open_esplibs/libmain/uart.c b/open_esplibs/libmain/uart.c
index 25ae961..5ee2699 100644
--- a/open_esplibs/libmain/uart.c
+++ b/open_esplibs/libmain/uart.c
@@ -1,3 +1,7 @@
+#include "open_esplibs.h"
+#if OPEN_LIBMAIN_UART
+// The contents of this file are only built if OPEN_LIBMAIN_UART is set to true
+
 #include "espressif/sdk_private.h"
 #include "esp/uart_regs.h"
 
@@ -15,3 +19,4 @@ void sdk_Uart_Init(void) {
     /* No-Op */
 }
 
+#endif /* OPEN_LIBMAIN_UART */
diff --git a/open_esplibs/libmain/xtensa_context.S b/open_esplibs/libmain/xtensa_context.S
index 511877e..139d5db 100644
--- a/open_esplibs/libmain/xtensa_context.S
+++ b/open_esplibs/libmain/xtensa_context.S
@@ -1,3 +1,7 @@
+#include "open_esplibs.h"
+#if OPEN_LIBMAIN_XTENSA_CONTEXT
+// The contents of this file are only built if OPEN_LIBMAIN_XTENSA_CONTEXT is set to true
+
         .section .iram1.text, "ax", @progbits
 
         .balign 4
@@ -39,3 +43,4 @@ sdk__xt_context_restore:
         l32i    a13, sp, 64
         ret
 
+#endif /* OPEN_LIBMAIN_XTENSA_CONTEXT */