AppVeyour and gcc.exe problems

[XVilka]

unning `C:\projects\radeco-lib-8ycg0\target\debug\build\backtrace-sys-81eabdbdcb0144d0\build-script-build`
[backtrace-sys 0.1.28] cargo:rustc-cfg=rbt
[backtrace-sys 0.1.28] TARGET = Some("i686-pc-windows-gnu")
[backtrace-sys 0.1.28] OPT_LEVEL = Some("0")
[backtrace-sys 0.1.28] HOST = Some("i686-pc-windows-gnu")
[backtrace-sys 0.1.28] CC_i686-pc-windows-gnu = None
[backtrace-sys 0.1.28] CC_i686_pc_windows_gnu = None
[backtrace-sys 0.1.28] HOST_CC = None
[backtrace-sys 0.1.28] CC = None
[backtrace-sys 0.1.28] CFLAGS_i686-pc-windows-gnu = None
[backtrace-sys 0.1.28] CFLAGS_i686_pc_windows_gnu = None
[backtrace-sys 0.1.28] HOST_CFLAGS = None
[backtrace-sys 0.1.28] CFLAGS = None
[backtrace-sys 0.1.28] CRATE_CC_NO_DEFAULTS = None
[backtrace-sys 0.1.28] CARGO_CFG_TARGET_FEATURE = Some("fxsr,mmx,sse,sse2")
[backtrace-sys 0.1.28] running: "gcc.exe" "-O0" "-ffunction-sections" "-fdata-sections" "-m32" "-I" "src/libbacktrace" "-I" "C:\\projects\\radeco-lib-8ycg0\\target\\debug\\build\\backtrace-sys-d7726cf13f88a8bc\\out" "-fvisibility=hidden" "-DBACKTRACE_SUPPORTED=1" "-DBACKTRACE_USES_MALLOC=1" "-DBACKTRACE_SUPPORTS_THREADS=0" "-DBACKTRACE_SUPPORTS_DATA=0" "-DHAVE_DL_ITERATE_PHDR=1" "-D_GNU_SOURCE=1" "-D_LARGE_FILES=1" "-Dbacktrace_full=__rbt_backtrace_full" "-Dbacktrace_dwarf_add=__rbt_backtrace_dwarf_add" "-Dbacktrace_initialize=__rbt_backtrace_initialize" "-Dbacktrace_pcinfo=__rbt_backtrace_pcinfo" "-Dbacktrace_syminfo=__rbt_backtrace_syminfo" "-Dbacktrace_get_view=__rbt_backtrace_get_view" "-Dbacktrace_release_view=__rbt_backtrace_release_view" "-Dbacktrace_alloc=__rbt_backtrace_alloc" "-Dbacktrace_free=__rbt_backtrace_free" "-Dbacktrace_vector_finish=__rbt_backtrace_vector_finish" "-Dbacktrace_vector_grow=__rbt_backtrace_vector_grow" "-Dbacktrace_vector_release=__rbt_backtrace_vector_release" "-Dbacktrace_close=__rbt_backtrace_close" "-Dbacktrace_open=__rbt_backtrace_open" "-Dbacktrace_print=__rbt_backtrace_print" "-Dbacktrace_simple=__rbt_backtrace_simple" "-Dbacktrace_qsort=__rbt_backtrace_qsort" "-Dbacktrace_create_state=__rbt_backtrace_create_state" "-Dbacktrace_uncompress_zdebug=__rbt_backtrace_uncompress_zdebug" "-o" "C:\\projects\\radeco-lib-8ycg0\\target\\debug\\build\\backtrace-sys-d7726cf13f88a8bc\\out\\src/libbacktrace\\alloc.o" "-c" "src/libbacktrace/alloc.c"
[backtrace-sys 0.1.28] 
[backtrace-sys 0.1.28] 
[backtrace-sys 0.1.28] error occurred: Failed to find tool. Is `gcc.exe` installed? (see https://github.com/alexcrichton/cc-rs#compile-time-requirements for help)
[backtrace-sys 0.1.28] 
[backtrace-sys 0.1.28] 
error: failed to run custom build command for `backtrace-sys v0.1.28`
Caused by:
  process didn't exit successfully: `C:\projects\radeco-lib-8ycg0\target\debug\build\backtrace-sys-81eabdbdcb0144d0\build-script-build` (exit code: 1)
--- stdout
cargo:rustc-cfg=rbt
TARGET = Some("i686-pc-windows-gnu")
OPT_LEVEL = Some("0")
HOST = Some("i686-pc-windows-gnu")
CC_i686-pc-windows-gnu = None
CC_i686_pc_windows_gnu = None
HOST_CC = None
CC = None
CFLAGS_i686-pc-windows-gnu = None
CFLAGS_i686_pc_windows_gnu = None
HOST_CFLAGS = None
CFLAGS = None
CRATE_CC_NO_DEFAULTS = None
CARGO_CFG_TARGET_FEATURE = Some("fxsr,mmx,sse,sse2")
running: "gcc.exe" "-O0" "-ffunction-sections" "-fdata-sections" "-m32" "-I" "src/libbacktrace" "-I" "C:\\projects\\radeco-lib-8ycg0\\target\\debug\\build\\backtrace-sys-d7726cf13f88a8bc\\out" "-fvisibility=hidden" "-DBACKTRACE_SUPPORTED=1" "-DBACKTRACE_USES_MALLOC=1" "-DBACKTRACE_SUPPORTS_THREADS=0" "-DBACKTRACE_SUPPORTS_DATA=0" "-DHAVE_DL_ITERATE_PHDR=1" "-D_GNU_SOURCE=1" "-D_LARGE_FILES=1" "-Dbacktrace_full=__rbt_backtrace_full" "-Dbacktrace_dwarf_add=__rbt_backtrace_dwarf_add" "-Dbacktrace_initialize=__rbt_backtrace_initialize" "-Dbacktrace_pcinfo=__rbt_backtrace_pcinfo" "-Dbacktrace_syminfo=__rbt_backtrace_syminfo" "-Dbacktrace_get_view=__rbt_backtrace_get_view" "-Dbacktrace_release_view=__rbt_backtrace_release_view" "-Dbacktrace_alloc=__rbt_backtrace_alloc" "-Dbacktrace_free=__rbt_backtrace_free" "-Dbacktrace_vector_finish=__rbt_backtrace_vector_finish" "-Dbacktrace_vector_grow=__rbt_backtrace_vector_grow" "-Dbacktrace_vector_release=__rbt_backtrace_vector_release" "-Dbacktrace_close=__rbt_backtrace_close" "-Dbacktrace_open=__rbt_backtrace_open" "-Dbacktrace_print=__rbt_backtrace_print" "-Dbacktrace_simple=__rbt_backtrace_simple" "-Dbacktrace_qsort=__rbt_backtrace_qsort" "-Dbacktrace_create_state=__rbt_backtrace_create_state" "-Dbacktrace_uncompress_zdebug=__rbt_backtrace_uncompress_zdebug" "-o" "C:\\projects\\radeco-lib-8ycg0\\target\\debug\\build\\backtrace-sys-d7726cf13f88a8bc\\out\\src/libbacktrace\\alloc.o" "-c" "src/libbacktrace/alloc.c"
--- stderr
error occurred: Failed to find tool. Is `gcc.exe` installed? (see https://github.com/alexcrichton/cc-rs#compile-time-requirements for help)