diff --git a/sysmoOCTSIM/gcc/Makefile b/sysmoOCTSIM/gcc/Makefile
index 52872e9..8b47909 100644
--- a/sysmoOCTSIM/gcc/Makefile
+++ b/sysmoOCTSIM/gcc/Makefile
@@ -2,6 +2,9 @@
 # Automatically-generated file. Do not edit!
 ################################################################################
 
+EXTRA_LIBS=/usr/local/arm-none-eabi/lib/libosmocore.a
+EXTRA_CFLAGS=-I/usr/local/arm-none-eabi/include
+
 ifdef SystemRoot
 	SHELL = cmd.exe
 	MK_DIR = mkdir
@@ -225,7 +228,7 @@
 $(OUTPUT_FILE_PATH): $(OBJS)
 	@echo Building target: $@
 	@echo Invoking: ARM/GNU Linker
-	$(QUOTE)arm-none-eabi-gcc$(QUOTE) -o $(OUTPUT_FILE_NAME).elf $(OBJS_AS_ARGS) -Wl,--start-group -lm -Wl,--end-group -mthumb \
+	$(QUOTE)arm-none-eabi-gcc$(QUOTE) -o $(OUTPUT_FILE_NAME).elf $(OBJS_AS_ARGS) $(EXTRA_LIBS) -Wl,--start-group -lm -Wl,--end-group -mthumb \
 -Wl,-Map="$(OUTPUT_FILE_NAME).map" --specs=nano.specs -Wl,--gc-sections -mcpu=cortex-m4 \
  \
 -T"../gcc/gcc/same54n19a_dfu.ld" \
@@ -253,7 +256,7 @@
 	@echo ARM/GNU C Compiler
 	$(QUOTE)arm-none-eabi-gcc$(QUOTE) -x c -mthumb -DDEBUG -Os -ffunction-sections -mlong-calls -g3 -Wall -c -std=gnu99 \
 -D__SAME54N19A__ -mcpu=cortex-m4 -mfloat-abi=softfp -mfpu=fpv4-sp-d16 \
--I"../" -I"../config" -I"../hal/include" -I"../hal/utils/include" -I"../hpl/cmcc" -I"../hpl/core" -I"../hpl/dmac" -I"../hpl/gclk" -I"../hpl/mclk" -I"../hpl/osc32kctrl" -I"../hpl/oscctrl" -I"../hpl/pm" -I"../hpl/port" -I"../hpl/ramecc" -I"../hpl/sercom" -I"../hpl/usb" -I"../hri" -I"../" -I"../config" -I"../usb" -I"../usb/class/cdc" -I"../usb/class/cdc/device" -I"../usb/class/ccid" -I"../usb/class/ccid/device" -I"../usb/device" -I"../" -I"../config" -I"../stdio_redirect" -I"../" -I"../dma_m2m" -I"../" -I"../CMSIS/Core/Include" -I"../include"  \
+-I"../" -I"../config" -I"../hal/include" -I"../hal/utils/include" -I"../hpl/cmcc" -I"../hpl/core" -I"../hpl/dmac" -I"../hpl/gclk" -I"../hpl/mclk" -I"../hpl/osc32kctrl" -I"../hpl/oscctrl" -I"../hpl/pm" -I"../hpl/port" -I"../hpl/ramecc" -I"../hpl/sercom" -I"../hpl/usb" -I"../hri" -I"../" -I"../config" -I"../usb" -I"../usb/class/cdc" -I"../usb/class/cdc/device" -I"../usb/class/ccid" -I"../usb/class/ccid/device" -I"../usb/device" -I"../" -I"../config" -I"../stdio_redirect" -I"../" -I"../dma_m2m" -I"../" -I"../CMSIS/Core/Include" -I"../include" $(EXTRA_CFLAGS) \
 -MD -MP -MF "$(@:%.o=%.d)" -MT"$(@:%.o=%.d)" -MT"$(@:%.o=%.o)"  -o "$@" "$<"
 	@echo Finished building: $<
 
diff --git a/sysmoOCTSIM/main.c b/sysmoOCTSIM/main.c
index c2a959b..3c189eb 100644
--- a/sysmoOCTSIM/main.c
+++ b/sysmoOCTSIM/main.c
@@ -709,6 +709,7 @@
 extern void testmode_init(void);
 
 #include "talloc.h"
+#include <osmocom/core/msgb.h>
 void *g_tall_ctx;
 
 DEFUN(_talloc_report, cmd_talloc_report, "talloc-report", "Generate a talloc report")
@@ -720,6 +721,7 @@
 {
 	for (int i = 0; i < 10; i++)
 		talloc_named_const(g_tall_ctx, 10, "sibling");
+	msgb_alloc_c(g_tall_ctx, 1024, "foo");
 }
 
 DEFUN(v_talloc_free, cmd_talloc_free, "talloc-free", "Release all memory")
@@ -728,6 +730,15 @@
 	g_tall_ctx = NULL;
 }
 
+/* dependency of libosmocore. FIXME: Implement it bsed on jiffies and/or RTC! */
+#include <sys/time.h>
+int _gettimeofday(struct timeval *tv, void *tz)
+{
+	tv->tv_sec = 0;
+	tv->tv_usec = 0;
+	return 0;
+}
+
 /* Section 9.6 of SAMD5x/E5x Family Data Sheet */
 static int get_chip_unique_serial(uint8_t *out, size_t len)
 {