In enum_cards: radeonvolt.c:(.text+0xfa): undefined reference to `pci_alloc'

[pmalek]

I am trying to compile that on Ubuntu 13.10 ( I see that it has been a while)

rm -f radeonvolt *.o
gcc -O3 -Wall -c radeonvolt.c
gcc -O3 -Wall -c i2c.c
gcc -O3 -Wall -c vt1165.c
gcc -O3 -Wall -lrt -lpci -o radeonvolt radeonvolt.o i2c.o vt1165.o
radeonvolt.o: In function `enum_cards':
radeonvolt.c:(.text+0xfa): undefined reference to `pci_alloc'
radeonvolt.c:(.text+0x104): undefined reference to `pci_init'
radeonvolt.c:(.text+0x10c): undefined reference to `pci_scan_bus'
radeonvolt.c:(.text+0x1a0): undefined reference to `pci_lookup_name'
radeonvolt.c:(.text+0x206): undefined reference to `pci_cleanup'
collect2: error: ld returned 1 exit status
make: *** [radeonvolt] Error 1

having

ii  libpci-dev                           1:3.1.9-6ubuntu9                                      i386         Linux PCI Utilities (development files)
ii  libpci3:i386                         1:3.1.9-6ubuntu9                                      i386         Linux PCI Utilities (shared library)
ii  libpciaccess-dev:i386                0.13.2-1                                              i386         Generic PCI access library for X - development files
ii  libpciaccess0:i386                   0.13.2-1                                              i386         Generic PCI access library for X
ii  pciutils                             1:3.1.9-6ubuntu9                                      i386         Linux PCI Utilities

[eRabbit0]

For Ubuntu 16.04., changing the order in Makefile helped to resolve the problem, just shift ${LDFLAGS} to the end of the line, like this:
${CC} ${CFLAGS} -o $@ $^ ${LDFLAGS}
The library reference has to be listed after the ".o" file, since the linker/loader processes the arguments in order.

[pmalek]

I cannot verify this solution anymore (I've sold my Radeons 2 years ago ;)) but it seems that it might be work.