Correct some comments in last email. The issue is not due to lacking of header file, it should be due to some constants are lost, I paste the whole error report here FYR: ../install/bin/musl-gcc -Isrc/common -Isrc/common -pipe -std=c99 -D_POSIX_C_SOURCE=200809L -Wall -Wno-unused-function -Wno-missing-braces -Wno-unused -Wno-overflow -Wno-unknown-pragmas -fno-builtin -frounding-math -Werror=implicit-function-declaration -Werror=implicit-int -Werror=pointer-sign -Werror=pointer-arith -g -D_FILE_OFFSET_BITS=64 -pedantic-errors -Werror -Wno-unused -D_XOPEN_SOURCE=700 -c -o src/api/unistd.o src/api/unistd.c 2>src/api/unistd.o.err || echo BUILDERROR src/api/unistd.o; cat src/api/unistd.o.err BUILDERROR src/api/unistd.o src/api/unistd.c: In function ‘f’: src/api/unistd.c:87:3: error: ‘_CS_POSIX_V7_THREADS_CFLAGS’ undeclared (first use in this function) 87 | C(_CS_POSIX_V7_THREADS_CFLAGS) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ src/api/unistd.c:5:21: note: in definition of macro ‘C’ 5 | #define C(n) switch(n){case n:;} | ^ src/api/unistd.c:87:3: note: each undeclared identifier is reported only once for each function it appears in 87 | C(_CS_POSIX_V7_THREADS_CFLAGS) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ src/api/unistd.c:5:21: note: in definition of macro ‘C’ 5 | #define C(n) switch(n){case n:;} | ^ src/api/unistd.c:88:3: error: ‘_CS_POSIX_V7_THREADS_LDFLAGS’ undeclared (first use in this function) 88 | C(_CS_POSIX_V7_THREADS_LDFLAGS) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ src/api/unistd.c:5:21: note: in definition of macro ‘C’ 5 | #define C(n) switch(n){case n:;} | ^ src/api/unistd.c:117:3: error: ‘_PC_TIMESTAMP_RESOLUTION’ undeclared (first use in this function) 117 | C(_PC_TIMESTAMP_RESOLUTION) | ^~~~~~~~~~~~~~~~~~~~~~~~ src/api/unistd.c:5:21: note: in definition of macro ‘C’ 5 | #define C(n) switch(n){case n:;} | ^ src/api/unistd.c:238:3: error: ‘_SC_XOPEN_UUCP’ undeclared (first use in this function) 238 | C(_SC_XOPEN_UUCP) | ^~~~~~~~~~~~~~ src/api/unistd.c:5:21: note: in definition of macro ‘C’ 5 | #define C(n) switch(n){case n:;} | ^ and this would cause the following main.exe and runtest.exe failed to be built. Best Regards Wang Chen 发件人: Chen Wang 发送时间: 2020-10-23 15:08 收件人: musl 抄送: unicorn_wang 主题: issue when running libc-test Hi, I'm not sure it's ok to post issue report about libc-test to this maillist, if it is not ok, please let me know. I downloaded the latest libc-test and run make, commit id of latest master is 287fe555a8279fab14e89e7cd64787d234a30ebf $ git clone git://repo.or.cz/libc-test $ cd libc-test $ CC=../install/bin/musl-gcc make I checked the output and see following error report: ../install/bin/musl-gcc -Isrc/common -Isrc/common -pipe -std=c99 -D_POSIX_C_SOURCE=200809L -Wall -Wno-unused-function -Wno-missing-braces -Wno-unused -Wno-overflow -Wno-unknown-pragmas -fno-builtin -frounding-math -Werror=implicit-function-declaration -Werror=implicit-int -Werror=pointer-sign -Werror=pointer-arith -g -D_FILE_OFFSET_BITS=64 -pedantic-errors -Werror -Wno-unused -D_XOPEN_SOURCE=700 -c -o src/api/unistd.o src/api/unistd.c 2>src/api/unistd.o.err || echo BUILDERROR src/api/unistd.o; cat src/api/unistd.o.err BUILDERROR src/api/unistd.o src/api/unistd.c: In function ‘f’: src/api/unistd.c:87:3: error: ‘_CS_POSIX_V7_THREADS_CFLAGS’ undeclared (first use in this function) 87 | C(_CS_POSIX_V7_THREADS_CFLAGS) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ I double checked and found it is due to lacking of "src/common/options.h", I found this file is not created successfully, and there is only src/common/options.h.in, that's make the build failed. Best Regards Wang Chen