Undefined reference to `oslIsWlanPowerOn' - g++

Question

I am developing a PSP homebrew application and I using the makefile from the exampel but it won't link because the stupid (excuse my French) linker says that oslIsWlanPowrOn is undefined. I know I am linking the right library, plus I am following an example so it should compile. I know most stackoverflow users don't use the oslib or do much psp programming but any help would be appreciated. I have also tried reordering the order of the libs but still states the same linker errors. Anyhow here is the code below:
Makefile
TARGET = main
OBJS = main.o
CFLAGS = -O2 -g -G0 -Wall
CXXFLAGS = $(CFLAGS) -fno-exceptions -fno-rtti
ASFLAGS = $(CFLAGS)
LIBDIR =
LIBS= -lpspwlan -losl -lpng -lz -lpspnet \
-lpsphprm -lpspsdk -lpspctrl -lpsprtc -lpsppower -lpspgu -lpspgum -lpspaudiolib -lpspaudio \
-lpspnet_adhocmatching -lpspnet_adhoc -lpspnet_adhocctl -lm -ljpeg
LDFLAGS =
EXTRA_TARGETS = EBOOT.PBP
PSP_EBOOT_TITLE = PSP Chat
#PSP_EBOOT_ICON = ICON0.PNG
PSPSDK=$(shell psp-config --pspsdk-path)
include $(PSPSDK)/lib/build.mak
Error details:
1>------ Build started: Project: PSP Chat, Configuration: Debug Win32 ------
1> psp-gcc -I. -IC:/pspsdk/psp/sdk/include -O2 -g -G0 -Wall -D_PSP_FW_VERSION=150 -L. -LC:/pspsdk/psp/sdk/lib main.o -lpspwlan -losl -lpng -lz -lpspnet -lpsphprm -lpspsdk -lpspctrl -lpsprtc -lpsppower -lpspgu -lpspgum -lpspaudiolib -lpspaudio -lpspnet_adhocmatching -lpspnet_adhoc -lpspnet_adhocctl -lm -ljpeg -lpspdebug -lpspdisplay -lpspge -lpspctrl -lpspsdk -lc -lpspnet -lpspnet_inet -lpspnet_apctl -lpspnet_resolver -lpsputility -lpspuser -lpspkernel -o main.elf
1> main.o: In function `main':
1> c:\Users\Danny\documents\visual studio 2010\Projects\PSP Chat\PSP Chat/main.cpp (24) : undefined reference to `oslIsWlanPowerOn'
1> c:\Users\Danny\documents\visual studio 2010\Projects\PSP Chat\PSP Chat/main.cpp (52) : undefined reference to `oslIsWlanPowerOn'
1> C:\pspsdk\bin\make: *** [main.elf] Error 1
========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========
main.cpp
#include <pspkernel.h>
#include <oslib\oslib.h>
PSP_MODULE_INFO("PSP Chat", 0, 1, 0);
OSL_FONT* font;
int main()
{
char* screename = (char*)malloc(100);
int skip = 0;
printf("Initializing OSL...");
oslInit(0);
printf("Loading Font...");
oslIntraFontInit(INTRAFONT_CACHE_MED);
font = oslLoadFontFile("flash0:/font/ltn0.pgf");
printf("Configuring Font Style...");
oslIntraFontSetStyle(font, 1.0, RGBA(0, 0, 255, 255), RGBA(0, 0, 0, 0), INTRAFONT_ALIGN_LEFT);
printf("Setting Font...");
oslSetFont(font);
while(!osl_quit)
{
if (!skip)
{
oslStartDrawing();
if (oslIsWlanPowerOn())
{
oslDrawString(10, 10, "Please Enter Screename By Pressing X (Client)...");
oslDrawString(10, 25, "Please Press O To Act As Server...");
if (oslOskIsActive()){
oslDrawOsk();
if (oslGetOskStatus() == PSP_UTILITY_DIALOG_NONE)
{
if (oslOskGetResult() == OSL_OSK_CANCEL)
{
screename = (char*)"Client";
}
else
{
oslOskGetText(screename);
}
oslEndOsk();
}
}
else
{
oslDrawString(10, 10, "Please turn on the wlan switch!");
}
oslEndDrawing();
}
oslEndFrame();
skip = oslSyncFrame();
oslReadKeys();
if (osl_keys->released.cross && oslIsWlanPowerOn())
{
oslInitOsk((char*)"Please enter screename!", (char*)"Client", 99, 1, -1);
}
}
}
sceKernelExitGame();
return 0;
}

Answer 1

There was a problem with the installation of the sdk and so I reinstalled it. Voila--it worked.
Thanks for everyone who tried to diagnose the problem.