Description of problem:
Package lcms fails to build from source in Fedora Rawhide.

 gcc -DPACKAGE_NAME=\"lcms\" -DPACKAGE_TARNAME=\"lcms\" -DPACKAGE_VERSION=\"1.19\" "-DPACKAGE_STRING=\"lcms 1.19\"" -DPACKAGE_BUGREPORT=\"\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_DLFCN_H=1 -DSIZEOF_INT=4 -DSIZEOF_UNSIGNED_INT=4 -DSIZEOF_LONG=8 -DSIZEOF_UNSIGNED_LONG=8 -DSIZEOF_LONG_LONG=8 -DSIZEOF_UNSIGNED_LONG_LONG=8 -DHasJPEG=1 -DHasZLIB=1 -DHasTIFF=1 -DHAVE_TIFFCONF_H=1 -I. -I../include -I../include -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m64 -mtune=generic -Werror=implicit-function-declaration -Werror=implicit-int -c cmslut.c  -fPIC -DPIC -o .libs/cmslut.o
cmsio1.c: In function 'AdjustEndianessArray16':
cmsio1.c:74:15: error: implicit declaration of function 'swab' [-Werror=implicit-function-declaration]
 #define xswab swab
               ^
cmsio1.c:118:8: note: in expansion of macro 'xswab'
        xswab((char*) p, (char*)p, (int) num_words * sizeof(WORD));
        ^~~~~

Version-Release number of selected component (if applicable):
1.19-17.fc25

Steps to Reproduce:
koji build --scratch f26 lcms-1.19-17.fc25.src.rpm

Additional info:
This package is tracked by Koschei. See:
http://apps.fedoraproject.org/koschei/package/lcms

The list of dependency changes since last successful build:
https://apps.fedoraproject.org/koschei/build/2391261