tss2-1027-2.fc28.x86_64 does not use the Fedora build flags from redhat-rpm-config. Examples from the build log:
/usr/bin/gcc -DTPM_POSIX -Wall -W -Wmissing-declarations -Wmissing-prototypes -Wnested-externs -Wformat=2 -Wold-style-definition -ggdb -O0 -c -DTPM_NUVOTON -I. -DTPM_TSS -fPIC tssfile.c
/usr/bin/gcc -DTPM_POSIX -L. -shared -Wl,-z,now -Wl,-soname,libtss.so.0 -o libtss.so.0.1 tssfile.o tsscryptoh.o tsscrypto.o tss.o tssproperties.o tssmarshal.o tssauth.o tssutils.o tsssocket.o tssdev.o tsstransmit.o tssresponsecode.o tssccattributes.o fail.o tssprint.o Unmarshal.o Commands.o CommandAttributeData.o ntc2lib.o tssntc.o
Both CFLAGS and LDFLAGS are missing.
See https://src.fedoraproject.org/rpms/redhat-rpm-config/blob/master/f/buildflags.md for information on RPM macros and environment variables provided by the build environment.
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