I installed lybpython which provides Python.h header..:

libpython3.5-dev: /usr/include/python3.5m/Python.h

I compiled bl31 in debug mode:

make CROSS_COMPILE=../../toolchain/gcc-linaro-aarch/bin/aarch64-linux-gnu- PLAT=sun50i_h6 DEBUG=1 bl31

CC drivers/arm/gic/common/gic_common.c

CC drivers/arm/gic/v2/gicv2_helpers.c

CC drivers/arm/gic/v2/gicv2_main.c

CC drivers/delay_timer/delay_timer.c

CC drivers/delay_timer/generic_delay_timer.c

CC plat/common/plat_gicv2.c

CC plat/common/plat_psci_common.c

CC plat/allwinner/common/sunxi_bl31_setup.c

CC plat/allwinner/common/sunxi_cpu_ops.c

CC plat/allwinner/common/sunxi_pm.c

CC plat/allwinner/sun50i_h6/sunxi_power.c

CC plat/allwinner/common/sunxi_security.c

CC plat/allwinner/common/sunxi_topology.c

CC bl31/bl31_main.c

CC bl31/interrupt_mgmt.c

CC bl31/bl31_context_mgmt.c

CC common/runtime_svc.c

CC services/arm_arch_svc/arm_arch_svc_setup.c

CC services/std_svc/std_svc_setup.c

CC lib/el3_runtime/cpu_data_array.c

CC lib/el3_runtime/aarch64/context_mgmt.c

CC lib/cpus/errata_report.c

CC lib/psci/psci_off.c

CC lib/psci/psci_on.c

CC lib/psci/psci_suspend.c

CC lib/psci/psci_common.c

CC lib/psci/psci_main.c

CC lib/psci/psci_setup.c

CC lib/psci/psci_system_off.c

CC lib/psci/psci_mem_protect.c

CC lib/locks/bakery/bakery_lock_normal.c

CC lib/extensions/spe/spe.c

CC lib/extensions/sve/sve.c

CC common/bl_common.c

CC common/tf_log.c

CC drivers/console/multi_console.c

CC plat/common/plat_bl_common.c

CC plat/common/plat_log_common.c

CC plat/common/aarch64/plat_common.c

CC common/backtrace/backtrace.c

CC lib/xlat_tables_v2/aarch64/xlat_tables_arch.c

CC lib/xlat_tables_v2/xlat_tables_context.c

CC lib/xlat_tables_v2/xlat_tables_core.c

CC lib/xlat_tables_v2/xlat_tables_utils.c

CC plat/allwinner/common/sunxi_common.c

CC drivers/mentor/i2c/mi2cv.c

AS lib/cpus/aarch64/cortex_a53.S

AS bl31/aarch64/bl31_entrypoint.S

AS bl31/aarch64/crash_reporting.S

AS bl31/aarch64/ea_delegate.S

AS bl31/aarch64/runtime_exceptions.S

AS lib/cpus/aarch64/dsu_helpers.S

AS plat/common/aarch64/platform_mp_stack.S

AS lib/el3_runtime/aarch64/cpu_data.S

AS lib/cpus/aarch64/cpu_helpers.S

AS lib/locks/exclusive/aarch64/spinlock.S

AS lib/psci/aarch64/psci_helpers.S

AS lib/el3_runtime/aarch64/context.S

AS lib/cpus/aarch64/wa_cve_2017_5715_bpiall.S

AS lib/cpus/aarch64/wa_cve_2017_5715_mmu.S

AS common/aarch64/debug.S

AS lib/aarch64/cache_helpers.S

AS lib/aarch64/misc_helpers.S

AS plat/common/aarch64/platform_helpers.S

AS drivers/ti/uart/aarch64/16550_console.S

AS lib/xlat_tables_v2/aarch64/enable_mmu.S

AS plat/allwinner/common/plat_helpers.S

PP bl31/bl31.ld.S

CC lib/libfdt/fdt.c

CC lib/libfdt/fdt_addresses.c

CC lib/libfdt/fdt_empty_tree.c

CC lib/libfdt/fdt_ro.c

CC lib/libfdt/fdt_rw.c

CC lib/libfdt/fdt_strerror.c

CC lib/libfdt/fdt_sw.c

CC lib/libfdt/fdt_wip.c

AR build/sun50i_h6/debug/lib/libfdt.a

CC lib/libc/abort.c

CC lib/libc/assert.c

CC lib/libc/exit.c

CC lib/libc/memchr.c

CC lib/libc/memcmp.c

CC lib/libc/memcpy.c

CC lib/libc/memmove.c

CC lib/libc/memset.c

CC lib/libc/printf.c

CC lib/libc/putchar.c

CC lib/libc/puts.c

CC lib/libc/snprintf.c

CC lib/libc/strchr.c

CC lib/libc/strcmp.c

CC lib/libc/strlcpy.c

CC lib/libc/strlen.c

CC lib/libc/strncmp.c

CC lib/libc/strnlen.c

CC lib/libc/strrchr.c

AS lib/libc/aarch64/setjmp.S

AR build/sun50i_h6/debug/lib/libc.a

LD build/sun50i_h6/debug/bl31/bl31.elf

BIN build/sun50i_h6/debug/bl31.bin

Built build/sun50i_h6/debug/bl31.bin successfully

OD build/sun50i_h6/debug/bl31/bl31.dump

Then copy 'build/sun50i_h6/debug/bl31.bin' to root ubbot folder, and then tried to compile it with:

make CROSS_COMPILE=../toolchain/gcc-linaro-aarch/bin/aarch64-linux-gnu- -I/usr/include/python3.5m -j4

make CROSS_COMPILE=../toolchain/gcc-linaro-aarch/bin/aarch64-linux-gnu- -j4

The Error is always the Same, related with Python.h header file..

CHK include/config/uboot.release

CHK include/generated/timestamp_autogenerated.h

./"board/sunxi/mksunxi_fit_atf.sh" \

arch/arm/dts/sun50i-h6-orangepi-one-plus.dtb > u-boot.its

HOSTCC scripts/basic/fixdep

UPD include/generated/timestamp_autogenerated.h

CHK include/generated/version_autogenerated.h

CHK include/config.h

CFG u-boot.cfg

CC lib/asm-offsets.s

CC arch/arm/lib/asm-offsets.s

HOSTCC scripts/dtc/dtc.o

PYMOD scripts/dtc/pylibfdt/_libfdt.so

CHK include/generated/generic-asm-offsets.h

CHK include/generated/asm-offsets.h

HOSTCC scripts/dtc/flattree.o

HOSTCC scripts/dtc/fstree.o

HOSTCC scripts/dtc/data.o

HOSTCC scripts/dtc/livetree.o

HOSTCC scripts/dtc/treesource.o

HOSTCC scripts/dtc/srcpos.o

HOSTCC scripts/dtc/checks.o

HOSTCC scripts/dtc/util.o

LEX scripts/dtc/dtc-lexer.lex.c

YACC scripts/dtc/dtc-parser.tab.h

YACC scripts/dtc/dtc-parser.tab.c

HOSTCC scripts/dtc/dtc-lexer.lex.o

HOSTCC scripts/dtc/dtc-parser.tab.o

LDS u-boot.lds

HOSTLD scripts/dtc/dtc

scripts/dtc/pylibfdt/libfdt_wrap.c:149:21: fatal error: Python.h: No such file or directory

# include <Python.h>

^

compilation terminated.

error: command 'cc' failed with exit status 1

scripts/dtc/pylibfdt/Makefile:27: recipe for target 'scripts/dtc/pylibfdt/_libfdt.so' failed

make[3]: *** [scripts/dtc/pylibfdt/_libfdt.so] Error 1

scripts/Makefile.build:434: recipe for target 'scripts/dtc/pylibfdt' failed

make[2]: *** [scripts/dtc/pylibfdt] Error 2

scripts/Makefile.build:434: recipe for target 'scripts/dtc' failed

make[1]: *** [scripts/dtc] Error 2

Makefile:508: recipe for target 'scripts' failed

make: *** [scripts] Error 2

SO, if fails trying to make:

scripts/dtc/pylibfdt/Makefile

on target:

$(obj)/_libfdt.so

And I have no way to tell him via -I were is the Python.h header.. :(