Unable to build with gcc 7.1.1

[lrvick]

gcc -Wall -Os -DHAVE_HIDAPI -DEXTRA_DEBUG -DDEBUG_COMM -I. -I/usr/local/include  -o bitcoinAmount.o -c bitcoinAmount.c
bitcoinAmount.c: In function ‘formatAmount’:
bitcoinAmount.c:127:36: warning: ‘.’ directive output may be truncated writing 1 byte into a region of size between 0 and 18 [-Wformat-truncation=]
     snprintf(tmp, sizeof(tmp) - 1, "%"PRId64".%08"PRId64"", quotient, remainder);
                                    ^~~
bitcoinAmount.c:127:36: note: directive argument in the range [0, 99999999]
bitcoinAmount.c:127:5: note: ‘snprintf’ output between 11 and 29 bytes into a destination of size 19
     snprintf(tmp, sizeof(tmp) - 1, "%"PRId64".%08"PRId64"", quotient, remainder);
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mkdir -p bin
gcc -Wall -Os -DHAVE_HIDAPI -DEXTRA_DEBUG -DDEBUG_COMM -I. -I/usr/local/include  -o btchipArgs.o -c btchipArgs.c
mkdir -p bin
gcc -Wall -Os -DHAVE_HIDAPI -DEXTRA_DEBUG -DDEBUG_COMM -I. -I/usr/local/include  -o dongleCommHidHidapi.o -c dongleCommHidHidapi.c
mkdir -p bin
gcc -Wall -Os -DHAVE_HIDAPI -DEXTRA_DEBUG -DDEBUG_COMM -I. -I/usr/local/include  -o dongleComm.o -c dongleComm.c
mkdir -p bin
gcc -Wall -Os -DHAVE_HIDAPI -DEXTRA_DEBUG -DDEBUG_COMM -I. -I/usr/local/include  -o ledgerLayer.o -c ledgerLayer.c
gcc commands/btchip_setup.o -L/usr/local/lib  hexUtils.o btchipUtils.o bitcoinVarint.o bitcoinTransaction.o bitcoinAmount.o btchipArgs.o dongleCommHidHidapi.o dongleComm.o ledgerLayer.o -o bin/btchip_setup -l hidapi-hidraw 
bitcoinAmount.o: In function `parseStringAmount':
bitcoinAmount.c:(.text+0xde): undefined reference to `atoi64'
collect2: error: ld returned 1 exit status
make: *** [Makefile.hidapi:26: btchip_setup] Error 1

[daurnimator]

20:08:24 | <~daurnimator> | lrvick: `bitcoinAmount.c:(.text+0xde): undefined reference to `atoi64'`
20:09:04 | <~daurnimator> | that's function is a windows-ism. you probably want atoll