$ lsb_release -a
No LSB modules are available.
Distributor ID: LinuxMint
Description:    Linux Mint 17.3 Rosa
Release:        17.3
Codename:       rosa

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$ uname -srvmpio
Linux 3.19.0-32-generic #37~14.04.1-Ubuntu SMP Thu Oct 22 09:41:40 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

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$ gcc --version
gcc (Ubuntu 4.8.4-2ubuntu1~14.04.3) 4.8.4

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$ sudo dgcconfig
Conexant DGC USB modem driver, version 1.13

If you need assistance or more information, please go to:
        http://www.linuxant.com/

When reporting a problem for the first time, please send
us the file generated by "dgcconfig --dumpdiag".

No pre-built modules for: Debian-jessie/sid linux-3.19.0-32-generic x86_64-SMP

Trying to automatically build the driver modules...
(this requires a C compiler and proper kernel sources to be installed)

Where is the linux source build directory that matches your running kernel?
[/lib/modules/3.19.0-32-generic/build]

Building modules for kernel 3.19.0-32-generic, using source directory
/lib/modules/3.19.0-32-generic/build. Please wait...

ERROR: Module build failed!
Please examine the log file "/tmp/dgcconfig-buildlog.txt" to determine why.

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$ cat /tmp/dgcconfig-buildlog.txt
(cd /lib/modules/3.19.0-32-generic/build && make "CNXT_KERNELSRC=/lib/modules/3.19.0-32-generic/build" "M=/usr/lib/dgcmodem/modules" "CC=gcc" clean)
make[1]: Entering directory `/usr/src/linux-headers-3.19.0-32-generic'
make[1]: Leaving directory `/usr/src/linux-headers-3.19.0-32-generic'
rm -rf *.o GPL/*.o *.ko GPL/*.ko *.mod.c GPL/*.mod.c .*.cmd GPL/.*.cmd .tmp_versions .tmp_versions  /lib/modules/3.19.0-32-generic/build/.tmp_versions/dgcusbdcp.mod Modules.symvers GPL/hda/Modules.symvers Module.symvers GPL/hda/Module.symvers modules.order GPL/hda/modules.order Module.markers GPL/hda/Module.markers
(cd /lib/modules/3.19.0-32-generic/build && make "CNXT_KERNELSRC=/lib/modules/3.19.0-32-generic/build" "M=/usr/lib/dgcmodem/modules" "CC=gcc" modules)
make[1]: Entering directory `/usr/src/linux-headers-3.19.0-32-generic'
  CC [M]  /usr/lib/dgcmodem/modules/mod_dgcusbdcp.o
/usr/lib/dgcmodem/modules/mod_dgcusbdcp.c:146:22: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'dgcusbdcp_probe'
 static int __devinit dgcusbdcp_probe(struct usb_interface *intf, const struct usb_device_id *id);
                      ^
/usr/lib/dgcmodem/modules/mod_dgcusbdcp.c:147:23: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'dgcusbdcp_disconnect'
 static void __devexit dgcusbdcp_disconnect(struct usb_interface *intf);
                       ^
/usr/lib/dgcmodem/modules/mod_dgcusbdcp.c:156:23: error: 'dgcusbdcp_probe' undeclared here (not in a function)
     .probe          = dgcusbdcp_probe,
                       ^
In file included from /usr/lib/dgcmodem/modules/mod_dgcusbdcp.c:57:0:
/usr/lib/dgcmodem/modules/mod_dgcusbdcp.c:157:35: error: 'dgcusbdcp_disconnect' undeclared here (not in a function)
     .disconnect     = __devexit_p(dgcusbdcp_disconnect),
                                   ^
/usr/lib/dgcmodem/modules/GPL/oscompat.h:342:24: note: in definition of macro '__devexit_p'
 #define __devexit_p(x) x
                        ^
/usr/lib/dgcmodem/modules/mod_dgcusbdcp.c: In function 'dgcUsbWrite':
/usr/lib/dgcmodem/modules/mod_dgcusbdcp.c:173:2: error: implicit declaration of function 'dbg' [-Werror=implicit-function-declaration]
  dbg ("%s: data=%p len=%d", __FUNCTION__, data, len);
  ^
/usr/lib/dgcmodem/modules/mod_dgcusbdcp.c:176:3: error: implicit declaration of function 'err' [-Werror=implicit-function-declaration]
   err("could not get a buffer for dgcUsbWrite (len=%d)\n", (int)len);
   ^
/usr/lib/dgcmodem/modules/mod_dgcusbdcp.c: At top level:
/usr/lib/dgcmodem/modules/mod_dgcusbdcp.c:309:22: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'dgcusbdcp_probe'
 static int __devinit dgcusbdcp_probe(struct usb_interface *intf,
                      ^
/usr/lib/dgcmodem/modules/mod_dgcusbdcp.c:594:23: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'dgcusbdcp_disconnect'
 static void __devexit dgcusbdcp_disconnect(struct usb_interface *intf)
                       ^
/usr/lib/dgcmodem/modules/mod_dgcusbdcp.c:167:1: warning: 'dgcUsbWrite' defined but not used [-Wunused-function]
 dgcUsbWrite(PUSBOSHAL pUsbOsHal, unsigned char *data, size_t len)
 ^
/usr/lib/dgcmodem/modules/mod_dgcusbdcp.c:196:1: warning: 'dgcUsbRxDone' defined but not used [-Wunused-function]
 dgcUsbRxDone(struct urb *urb
 ^
/usr/lib/dgcmodem/modules/mod_dgcusbdcp.c:265:21: warning: 'dgcusbdcp_instance_bitmap' defined but not used [-Wunused-variable]
 static unsigned int dgcusbdcp_instance_bitmap;
                     ^
cc1: some warnings being treated as errors
make[2]: *** [/usr/lib/dgcmodem/modules/mod_dgcusbdcp.o] Error 1
make[1]: *** [_module_/usr/lib/dgcmodem/modules] Error 2
make[1]: Leaving directory `/usr/src/linux-headers-3.19.0-32-generic'
make: *** [all] Error 2
$