nix-build -A hel --dry-run

output.sh

 nix-build -A hel --dry-run
these derivations will be built:
  /nix/store/c68mkv98pjnyr1vlwkr779k3z1lyngnx-aarch64-unknown-linux-gnu-stage-static-gcc-debug-9.2.0.drv
  /nix/store/nwwx3phglpgf9pmyskvk0q5dkwwgak94-aarch64-unknown-linux-gnu-stage-static-gcc-debug-wrapper-9.2.0.drv
  /nix/store/hkl18h5xhfvz4q8dmh5k9x28k25dbj60-stdenv-linux.drv
  /nix/store/5hpimds0arf1yfdv53d733g08aw0im7q-glibc-2.30-aarch64-unknown-linux-gnu.drv
  /nix/store/2566sbq43kqfgfwv7ifnd3dym8y08090-aarch64-unknown-linux-gnu-binutils-wrapper-2.31.1.drv
  /nix/store/l9zc0hbpp4ilhfbdfxs46prsqz0dfdzp-aarch64-unknown-linux-gnu-stage-final-gcc-debug-9.2.0.drv
  /nix/store/36llj85f2mqbrghmijq5hbp3hcbvafd4-aarch64-unknown-linux-gnu-stage-final-gcc-debug-wrapper-9.2.0.drv
  /nix/store/v2agr7xnipzxxszsgrbjmv3s493f2dv1-stdenv-linux.drv
  /nix/store/jd6nb39nr46cnn5ppfxl5az732i38p7h-ncurses-6.1-20190112-aarch64-unknown-linux-gnu.drv
  /nix/store/sgddf570sqmm1xlada0fpv6rklwymsay-gmp-6.2.0-aarch64-unknown-linux-gnu.drv
  /nix/store/zw7nfyb4l92139rfc26xnlji4g43m0dn-libffi-3.3-aarch64-unknown-linux-gnu.drv
  /nix/store/g5rnml5pyh4j1i0yfci9gic3qwp5izbd-aarch64-unknown-linux-gnu-ghc-8.6.5.drv
  /nix/store/f9v3lw045kc6mj22ca3kwv8j8sn1bbvv-hello-cross-compile-0.1.0.0-aarch64-unknown-linux-gnu.drv

with import { system = "aarch64-linux"; }

$> nix-build -A hel --dry-run

these derivations will be built:
/nix/store/gd5mnv9bdl1vlfw5as3lsqi7zmcfj9r9-remove-references-to.drv
/nix/store/8d887z1g8p7p44fiafg2z78mnkz62ip9-hscolour-1.24.4.drv
/nix/store/3pkwj2ya10ndb8py2pf7dvwny3iwd55f-mtl-2.2.2.drv
/nix/store/4ziwiagw8krcvxv6bxyrsx2vks18qr0a-hscolour-1.24.4.drv
/nix/store/63lv2yk4czq4gvs7lzn49azy7mh1811r-happy-1.19.12.drv
/nix/store/mjdkfkj6rwi5w6bz0n55dijqigal6g6h-alex-3.2.5.drv
/nix/store/n6f5rv2k6a109xhandk9s08j19mm6b3m-ghc-8.6.5.drv
/nix/store/yfw6rs13ijv90ljs2pi5fr3qjx6jvhsm-hello-cross-compile-0.1.0.0.drv
these paths will be fetched (277.87 MiB download, 2703.02 MiB unpacked):
/nix/store/01gwq72k9cyrs8s8y69m74ayjyswjb9q-python3.7-pyOpenSSL-19.1.0
/nix/store/0876xwghspgppx77djgk15v6058va94p-gnu-config-2019-04-15
/nix/store/13xnqvhjnay17nzmg7pznbfrg76di61h-glibc-locales-2.30
/nix/store/2d134vgaxqd04qcal0y4xsxn37kalvjq-python3.7-cffi-1.13.2-dev
/nix/store/2sgk68v38wj5fc264b8nl2znz8j1ijf8-ncurses-6.1-20190112
/nix/store/2vn35phq7d4q3q6pi6jipxy1h1x3346s-glibc-2.30
/nix/store/3rzw9fpwfbvmgyn91bcym9z9iajl9nvq-patch-2.7.6
/nix/store/3zb6gvr81sjbp1x3j2rafqifyph7wdfj-bash-4.4-p23-dev
/nix/store/41392k1f1n51q02cvj5bv6wryz17smix-perl-5.30.1
/nix/store/4yl3mqfsdw7pvc91nawj2x4xlzr8rwsp-python3.7-sphinxcontrib-serializinghtml-1.1.3
/nix/store/4zaj6l825qhgqfi3g8fd9z3jxpzj8n45-sqlite-3.30.1
/nix/store/56aibp735l8017wdwskhnkck22nwlx42-binutils-wrapper-2.31.1
/nix/store/5ad6ykvh3m6m3ci64llx7wz54mqj1r3s-stdenv-linux
/nix/store/5ldy5ffqg3kw302knpx8cv55rz2j8wwc-gawk-5.0.1
/nix/store/5yl0nksal3b3i450v93xbir1gm501zcs-gcc-9.2.0-lib
/nix/store/655mlqn1m5a0pipa1bf33wyddvb061q6-python3.7-packaging-20.1
/nix/store/6maii6x2ik4yg9z7r85i7ygv1g3866jm-ghc-8.2.2-binary
/nix/store/6n6910p2pbbbkbyii4anmxaa8iyns78r-python3.7-cryptography-2.8
/nix/store/6s1l42rf330qn2cw7wy42d3zkwbzz1kz-python3.7-pysocks-1.7.1
/nix/store/75jmwj57cjw8cq8wvdny549caxwq7fgh-python3.7-Whoosh-2.7.4
/nix/store/7jdfs9mdvld86aakniaw62jd1326pw0g-linux-headers-4.19.16
/nix/store/7l5hd7vdivzysbs84i204km28r6fk3hg-bzip2-1.0.6.0.1
/nix/store/88616rhrl6ig988bprz6pf7hrgqa5p0r-automake-1.16.1
/nix/store/8c799bhzfygwrj74x5flcwxg51ysh8km-stdenv-linux
/nix/store/8yr36rlfblcsqir4cga82gcgnvl8pacm-xz-5.2.4
/nix/store/9mbg9lkzhnxfaz0ykkfzqdmwj2m3snfc-xz-5.2.4-bin
/nix/store/9szcjf811s4j0cjlmxwbs8vsrnnpvhph-python3.7-cffi-1.13.2
/nix/store/agadvxpvis4a60ssywhkmbk4hys5l9ns-python3.7-pytz-2019.3
/nix/store/amdqalki7anlvm5x433cn43wh4dy1qfy-glibc-2.30-bin
/nix/store/b18p253iphxbb8pvv9g16nvj14yjkqjc-libunistring-0.9.10
/nix/store/bb42zrnsvyjfpxdqay8yalspw4jxmx4j-python3.7-alabaster-0.7.12
/nix/store/c5a3sjnpn0cr31y4qykzmp1hj91jy2mv-attr-2.4.48
/nix/store/c72s3mppa47qjfyvkjj4jzj7m5k87j4q-findutils-4.7.0
/nix/store/cl7n1fz8p0a5v1n4yn5jcn1069xar5am-libidn2-2.3.0
/nix/store/cn6kgbsxqhkqdjybxspylaf3swhyr601-gcc-9.2.0
/nix/store/d3dj2zrxqzbmrw0ilvxlph2dl3abdf92-diffutils-3.7
/nix/store/f9gh6y61c04745529fx4wyirclmm39hc-gzip-1.10
/nix/store/fin4jhvz9hgafk7vmqgzxlpqf6fhv0z8-python3.7-imagesize-1.1.0
/nix/store/fss3vqyi22czc3v732yv0mzl5aby6ylc-python3.7-pyasn1-0.4.8
/nix/store/g7v6r8hq8hjhrnkl2q4myzngbrb903ih-ncurses-6.1-20190112-man
/nix/store/gpg2p15ig8p5xs5gf77wp8p6xpwpwy94-binutils-2.31.1
/nix/store/gvdcnngd5y0hq3m3ipw8pqv4zg06kmm5-expat-2.2.8
/nix/store/gx43plsxq4f7ymwb9pwwcnhzhcn2nx8r-python3.7-sphinxcontrib-devhelp-1.0.1
/nix/store/h3yclsafc1hg007w9fc3ivrm4493di8c-gcc-wrapper-9.2.0
/nix/store/h73668biqhij8aayswnspcw4fq02i5y9-python3.7-setuptools-44.0.0
/nix/store/hkp9p9qi51sb9glyna3v974dr92sa8ma-python3.7-sphinxcontrib-qthelp-1.0.2
/nix/store/hmxdpf0zn1w82x3i20vfnmbcg33qsbpv-python3.7-sphinxcontrib-websupport-1.1.2
/nix/store/icm8i35z9r5qpklv484lnl429dp311j8-libffi-3.3
/nix/store/imcriy49gw97dli3afsih3fyx5sxfmyd-python3.7-requests-2.22.0
/nix/store/imkhxfx6yppiiymbxz03412wznhlpv7d-ed-1.15
/nix/store/imyz80mqnrdj1k2w5siaabh7i9gz14va-patchelf-0.9
/nix/store/iqw327b5q4m9mmrbnn2wqyr1alsff7ak-python3.7-pyparsing-2.4.6
/nix/store/j12bg350q5xxk2aj2zg0pmmnxqphpsjy-gdbm-1.18.1
/nix/store/j36wkan5mc9gmdmn3m6jv2l3qzicfs08-python3.7-six-1.14.0
/nix/store/jplbjcqcwfw96jr3jh6ncf7z5g5hikpb-python3.7-sphinxcontrib-applehelp-1.0.1
/nix/store/jyg517sf358mb8ch82yw546hh7ii34fy-zlib-1.2.11-dev
/nix/store/kk9frs6dniqxvkf4ys255q6ifif0xq53-ncurses-6.1-20190112-dev
/nix/store/kv993s9akc59grrdqdd80wbx5b5xqp7h-acl-2.2.53
/nix/store/kzyib9y84f4r50d9nb26ph9fr3iz9al3-python3.7-urllib3-1.25.8
/nix/store/l7p9pxqp7054m05x2y3r67gd9mrrvy9r-libxml2-2.9.10
/nix/store/lfpcyfkpr08bgchr97fykqwwyy179x7b-gnumake-4.2.1
/nix/store/m3zs3p9b3hwd596nm78cy94n4bm0swp4-python3.7-PyStemmer-1.3.0
/nix/store/mm97zq7phy447h8jkyp22sn9rv52qhg8-python3-3.7.6
/nix/store/msfiyi8p1jm7s8pzsxcr8aqv4ywzmb4b-glibc-2.30-dev
/nix/store/mssh2v3plpcixlmfdzbyigvhmrl97gqv-pcre-8.43
/nix/store/n2934112ybyk13ysjmk2rjaa9jfqqp1i-gnum4-1.4.18
/nix/store/p2xgvxjbsh6idcfllnj2wh3mgjwm16g8-python3.7-MarkupSafe-1.1.1
/nix/store/p8vm4hrqrp43hfpwiddg8y6xddhynjhz-mtl-2.2.2.tar.gz
/nix/store/q63wvw3cf7gra3jpja4p216nh2haxsxj-autoconf-2.69
/nix/store/qa79fvrbxrgxx9pl1yqjmv82183z6n4s-bash-4.4-p23
/nix/store/qcbf8dv0kcgs5lkfbs4f2vwszqsfsfbp-coreutils-8.31
/nix/store/qhbgk9111c2gp3f5x00xvxk30gv1vizq-python3.7-cryptography-2.8-dev
/nix/store/qy2may71rxd4b4y5b0fnwc4q9zzxclqs-gmp-6.2.0
/nix/store/qzn37qjrldfd1yic7n9v04d36z0ciyhs-happy-1.19.12.tar.gz
/nix/store/r1c4r2ckrffd6398l19qi6xpi42jm55m-llvm-6.0.1-lib
/nix/store/r7g7v8fnz8zkry4qny11grh1883kwv9l-python3.7-snowballstemmer-2.0.0
/nix/store/rd16nh71c50y4j5h696bjrhip7316ipv-python3.7-idna-2.8
/nix/store/rd9v0cc18sd20k6vnslnr56qzw1pwc8m-python3.7-docutils-0.16
/nix/store/rf1ca7a3hcd4klxzx042mblg4182dbc5-python3.7-sphinxcontrib-htmlhelp-1.0.2
/nix/store/rjq2inhh1y3j3wci26m2a5bqq1il3lkw-gnused-4.8
/nix/store/rn83nbnmsv2v3ldakf1frl93q4zv5hbm-gnugrep-3.4
/nix/store/rpkbgzxq8qj9hc8zd0bfkqz2r2r7h96r-gmp-6.2.0-dev
/nix/store/rsd72zdyk1i1cynhvlc3qxzys5whfgsd-bzip2-1.0.6.0.1-bin
/nix/store/s026pr1gjcw632l4fz36rv1nyqczp285-python3.7-pyOpenSSL-19.1.0-dev
/nix/store/vbcisx90wrx657pa1iapmk38wvrv9p6p-hscolour-1.24.4.tar.gz
/nix/store/vh3j06nj24xh1ii2gy5xfggzbqz8pbjb-python3.7-certifi-2019.11.28
/nix/store/vi8gyvyh6n3n88jlq7njp72x43y6z3zs-python3.7-sphinxcontrib-jsmath-1.0.1
/nix/store/vsvbw19xmaa96qa6sxvlbapf2cfi5z78-python3.7-chardet-3.0.4
/nix/store/vz9gp51pr16yqcd7zlmz44jj4is2wp9p-python3.7-sphinx-2.3.1
/nix/store/w4bcgflwijpwmbmzp62ybhk91hkj7icy-python3.7-Jinja2-2.11.1
/nix/store/x0ig066xwz8dwsyyxgkkav0f63caqd69-hook
/nix/store/x90v6grkvnasfb4k6x529vi993yghv14-alex-3.2.5.tar.gz
/nix/store/x9kys000vmpw34kqa20c2dv04xrjjrai-gnutar-1.32
/nix/store/xa6ga3rzspk1fz98kb8fk61k9wfiw3bm-expand-response-params
/nix/store/xaq8hbyc98hsf9q5xnacq56z5vv47k4z-zlib-1.2.11
/nix/store/xasg24rng07rpyam404bay6jygw4sv8g-ncurses-6.1-20190112-abi5-compat
/nix/store/xhwbp20dwf6nln98zkl70rp205mgrx4g-libffi-3.3-dev
/nix/store/xs1nvvxdlrq2lnf6p5804p5nsbgidqvw-llvm-6.0.1
/nix/store/y65gjpqld728165ahanm9bcggmv5x2x9-openssl-1.1.1d
/nix/store/zg9klapxrjz6j9dy1dyb1bzqlkqzr90n-python3.7-Babel-2.7.0
/nix/store/zgqszrxvrih2j5p75ldd3447drm1hxb2-python3.7-Pygments-2.5.2
/nix/store/zk2v10na4fw370fw55fy5amhr814cc1b-python3.7-pycparser-2.19
/nix/store/zsf8dddcn39qlb2ralqilxchk09ki0xk-readline-6.3p08