Bug#1143420: silentjack: FTBFS: checking for JACK... configure: error: in `/<<PKGBUILDDIR>>':

Package: src:silentjack
Version: 0.3-4
Severity: serious
Tags: ftbfs forky sid

Dear maintainer:

During a rebuild of all packages in unstable, this package failed to build.

Below you will find the last part of the build log (probably the most
relevant part, but not necessarily). If required, the full build log
is available here:

https://people.debian.org/~sanvila/build-logs/202608/

About the archive rebuild: The build was made on virtual machines from AWS,
using sbuild and a reduced chroot with only build-essential packages.

If you cannot reproduce the bug please contact me privately, as I
am willing to provide ssh access to a virtual machine where the bug is
fully reproducible.

If this is really a bug in one of the build-depends, please use
reassign and add an affects on src:silentjack, so that this is still
visible in the BTS web page for this package.

Thanks.

--------------------------------------------------------------------------------
[...]
 debian/rules clean
dh clean --buildsystem=autoconf --without autoreconf
   dh_auto_clean -O--buildsystem=autoconf
   dh_clean -O--buildsystem=autoconf
 debian/rules binary
dh binary --buildsystem=autoconf --without autoreconf
   dh_update_autotools_config -O--buildsystem=autoconf
   dh_auto_configure -O--buildsystem=autoconf
	./configure --build=x86_64-linux-gnu --prefix=/usr --includedir=\${prefix}/include --mandir=\${prefix}/share/man --infodir=\${prefix}/share/info --sysconfdir=/etc --localstatedir=/var --disable-option-checking --disable-silent-rules --libdir=\${prefix}/lib/x86_64-linux-gnu --libexecdir=\${prefix}/lib/x86_64-linux-gnu --disable-maintainer-mode --disable-dependency-tracking
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /usr/bin/mkdir -p
checking for gawk... no
checking for mawk... mawk
checking whether make sets $(MAKE)... yes
checking for gcc... x86_64-linux-gnu-gcc
checking for C compiler default output file name... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables... 
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether x86_64-linux-gnu-gcc accepts -g... yes
checking for x86_64-linux-gnu-gcc option to accept ISO C89... none needed
checking for style of include used by make... GNU
checking dependency style of x86_64-linux-gnu-gcc... none
checking for a BSD-compatible install... /usr/bin/install -c
checking whether ln -s works... yes
checking for inline... inline
checking for an ANSI C-conforming const... yes
checking for sqrt in -lm... yes
checking for powf in -lmx... no
checking for pkg-config... no
checking for JACK... configure: error: in `/<<PKGBUILDDIR>>':
configure: error: The pkg-config script could not be found or is too old.  Make sure it
is in your PATH or set the PKG_CONFIG environment variable to the full
path to pkg-config.

Alternatively, you may set the environment variables JACK_CFLAGS
and JACK_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.

To get pkg-config, see <http://pkg-config.freedesktop.org/>.
See `config.log' for more details.
	tail -v -n \+0 config.log
==> config.log <==
This file contains any messages produced by compilers while
running configure, to aid debugging if configure makes a mistake.

It was created by silentjack configure 0.3, which was
generated by GNU Autoconf 2.63.  Invocation command line was

  $ ./configure --build=x86_64-linux-gnu --prefix=/usr --includedir=${prefix}/include --mandir=${prefix}/share/man --infodir=${prefix}/share/info --sysconfdir=/etc --localstatedir=/var --disable-option-checking --disable-silent-rules --libdir=${prefix}/lib/x86_64-linux-gnu --libexecdir=${prefix}/lib/x86_64-linux-gnu --disable-maintainer-mode --disable-dependency-tracking

## --------- ##
## Platform. ##
## --------- ##

hostname = sbuild
uname -m = x86_64
uname -r = 6.12.100+deb13-cloud-amd64
uname -s = Linux
uname -v = #1 SMP PREEMPT_DYNAMIC Debian 6.12.100-1 (2026-07-30)

/usr/bin/uname -p = unknown
/bin/uname -X     = unknown

/bin/arch              = x86_64
/usr/bin/arch -k       = unknown
/usr/convex/getsysinfo = unknown
/usr/bin/hostinfo      = unknown
/bin/machine           = unknown
/usr/bin/oslevel       = unknown
/bin/universe          = unknown

PATH: /usr/local/sbin
PATH: /usr/local/bin
PATH: /usr/sbin
PATH: /usr/bin
PATH: /sbin
PATH: /bin
PATH: /usr/games


## ----------- ##
## Core tests. ##
## ----------- ##

configure:1883: checking for a BSD-compatible install
configure:1951: result: /usr/bin/install -c
configure:1962: checking whether build environment is sane
configure:2022: result: yes
configure:2163: checking for a thread-safe mkdir -p
configure:2202: result: /usr/bin/mkdir -p
configure:2215: checking for gawk
configure:2245: result: no
configure:2215: checking for mawk
configure:2231: found /usr/bin/mawk
configure:2242: result: mawk
configure:2253: checking whether make sets $(MAKE)
configure:2275: result: yes
configure:2407: checking for gcc
configure:2434: result: x86_64-linux-gnu-gcc
configure:2666: checking for C compiler version
configure:2674: x86_64-linux-gnu-gcc --version >&5
x86_64-linux-gnu-gcc (Debian 16.1.0-3) 16.1.0
Copyright (C) 2026 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

configure:2678: $? = 0
configure:2685: x86_64-linux-gnu-gcc -v >&5
Using built-in specs.
COLLECT_GCC=x86_64-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-linux-gnu/16/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debi [too-long-redacted] n --enable-link-serialization=3
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 16.1.0 (Debian 16.1.0-3) 
configure:2689: $? = 0
configure:2696: x86_64-linux-gnu-gcc -V >&5
x86_64-linux-gnu-gcc: error: unrecognized command-line option '-V'
x86_64-linux-gnu-gcc: fatal error: no input files
compilation terminated.
configure:2700: $? = 1
configure:2723: checking for C compiler default output file name
configure:2745: x86_64-linux-gnu-gcc -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wdate-time -D_FORTIFY_SOURCE=2 -Wl,-z,relro conftest.c  >&5
configure:2749: $? = 0
configure:2787: result: a.out
configure:2806: checking whether the C compiler works
configure:2816: ./a.out
configure:2820: $? = 0
configure:2839: result: yes
configure:2846: checking whether we are cross compiling
configure:2848: result: no
configure:2851: checking for suffix of executables
configure:2858: x86_64-linux-gnu-gcc -o conftest -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wdate-time -D_FORTIFY_SOURCE=2 -Wl,-z,relro conftest.c  >&5
configure:2862: $? = 0
configure:2888: result: 
configure:2894: checking for suffix of object files
configure:2920: x86_64-linux-gnu-gcc -c -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wdate-time -D_FORTIFY_SOURCE=2 conftest.c >&5
configure:2924: $? = 0
configure:2949: result: o
configure:2953: checking whether we are using the GNU C compiler
configure:2982: x86_64-linux-gnu-gcc -c -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wdate-time -D_FORTIFY_SOURCE=2 conftest.c >&5
configure:2989: $? = 0
configure:3006: result: yes
configure:3015: checking whether x86_64-linux-gnu-gcc accepts -g
configure:3045: x86_64-linux-gnu-gcc -c -g -Wdate-time -D_FORTIFY_SOURCE=2 conftest.c >&5
configure:3052: $? = 0
configure:3153: result: yes
configure:3170: checking for x86_64-linux-gnu-gcc option to accept ISO C89
configure:3244: x86_64-linux-gnu-gcc  -c -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wdate-time -D_FORTIFY_SOURCE=2 conftest.c >&5
conftest.c: In function 'e':
conftest.c:17:14: warning: old-style function definition [-Wold-style-definition]
   17 | static char *e (p, i)
      |              ^
configure:3251: $? = 0
configure:3274: result: none needed
configure:3303: checking for style of include used by make
configure:3331: result: GNU
configure:3356: checking dependency style of x86_64-linux-gnu-gcc
configure:3466: result: none
configure:3495: checking for a BSD-compatible install
configure:3563: result: /usr/bin/install -c
configure:3574: checking whether ln -s works
configure:3578: result: yes
configure:3586: checking for inline
configure:3612: x86_64-linux-gnu-gcc -c -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wdate-time -D_FORTIFY_SOURCE=2 conftest.c >&5
configure:3619: $? = 0
configure:3637: result: inline
configure:3656: checking for an ANSI C-conforming const
configure:3731: x86_64-linux-gnu-gcc -c -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wdate-time -D_FORTIFY_SOURCE=2 conftest.c >&5
configure:3738: $? = 0
configure:3753: result: yes
configure:3766: checking for sqrt in -lm
configure:3801: x86_64-linux-gnu-gcc -o conftest -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wdate-time -D_FORTIFY_SOURCE=2 -Wl,-z,relro conftest.c -lm   >&5
conftest.c:17:6: warning: conflicting types for built-in function 'sqrt'; expected 'double(double)' [-Wbuiltin-declaration-mismatch]
   17 | char sqrt ();
      |      ^~~~
conftest.c:1:1: note: 'sqrt' is declared in header '<math.h>'
    1 | /* confdefs.h.  */
configure:3808: $? = 0
configure:3829: result: yes
configure:3845: checking for powf in -lmx
configure:3880: x86_64-linux-gnu-gcc -o conftest -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wdate-time -D_FORTIFY_SOURCE=2 -Wl,-z,relro conftest.c -lmx  -lm  >&5
conftest.c:18:6: warning: conflicting types for built-in function 'powf'; expected 'float(float,  float)' [-Wbuiltin-declaration-mismatch]
   18 | char powf ();
      |      ^~~~
conftest.c:1:1: note: 'powf' is declared in header '<math.h>'
    1 | /* confdefs.h.  */
/usr/bin/x86_64-linux-gnu-ld.bfd: cannot find -lmx: No such file or directory
collect2: error: ld returned 1 exit status
configure:3887: $? = 1
configure: failed program was:
| /* confdefs.h.  */
| #define PACKAGE_NAME "silentjack"
| #define PACKAGE_TARNAME "silentjack"
| #define PACKAGE_VERSION "0.3"
| #define PACKAGE_STRING "silentjack 0.3"
| #define PACKAGE_BUGREPORT "[email protected]"
| #define PACKAGE "silentjack"
| #define VERSION "0.3"
| #define HAVE_LIBM 1
| /* end confdefs.h.  */
| 
| /* Override any GCC internal prototype to avoid an error.
|    Use char because int might match the return type of a GCC
|    builtin and then its argument prototype would still apply.  */
| #ifdef __cplusplus
| extern "C"
| #endif
| char powf ();
| int
| main ()
| {
| return powf ();
|   ;
|   return 0;
| }
configure:3908: result: no
configure:3970: checking for pkg-config
configure:4003: result: no
configure:4039: checking for JACK
configure:4116: error: in `/<<PKGBUILDDIR>>':
configure:4118: error: The pkg-config script could not be found or is too old.  Make sure it
is in your PATH or set the PKG_CONFIG environment variable to the full
path to pkg-config.

Alternatively, you may set the environment variables JACK_CFLAGS
and JACK_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.

To get pkg-config, see <http://pkg-config.freedesktop.org/>.
See `config.log' for more details.

## ---------------- ##
## Cache variables. ##
## ---------------- ##

ac_cv_c_compiler_gnu=yes
ac_cv_c_const=yes
ac_cv_c_inline=inline
ac_cv_env_CC_set=set
ac_cv_env_CC_value=x86_64-linux-gnu-gcc
ac_cv_env_CFLAGS_set=set
ac_cv_env_CFLAGS_value='-g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection'
ac_cv_env_CPPFLAGS_set=set
ac_cv_env_CPPFLAGS_value='-Wdate-time -D_FORTIFY_SOURCE=2'
ac_cv_env_CPP_set=
ac_cv_env_CPP_value=
ac_cv_env_JACK_CFLAGS_set=
ac_cv_env_JACK_CFLAGS_value=
ac_cv_env_JACK_LIBS_set=
ac_cv_env_JACK_LIBS_value=
ac_cv_env_LDFLAGS_set=set
ac_cv_env_LDFLAGS_value=-Wl,-z,relro
ac_cv_env_LIBS_set=
ac_cv_env_LIBS_value=
ac_cv_env_PKG_CONFIG_set=
ac_cv_env_PKG_CONFIG_value=
ac_cv_env_build_alias_set=set
ac_cv_env_build_alias_value=x86_64-linux-gnu
ac_cv_env_host_alias_set=
ac_cv_env_host_alias_value=
ac_cv_env_target_alias_set=
ac_cv_env_target_alias_value=
ac_cv_lib_m_sqrt=yes
ac_cv_lib_mx_powf=no
ac_cv_objext=o
ac_cv_path_install='/usr/bin/install -c'
ac_cv_path_mkdir=/usr/bin/mkdir
ac_cv_prog_AWK=mawk
ac_cv_prog_ac_ct_CC=x86_64-linux-gnu-gcc
ac_cv_prog_cc_c89=
ac_cv_prog_cc_g=yes
ac_cv_prog_make_make_set=yes
am_cv_CC_dependencies_compiler_type=none

## ----------------- ##
## Output variables. ##
## ----------------- ##

ACLOCAL='${SHELL} /<<PKGBUILDDIR>>/build-scripts/missing --run aclocal-1.11'
AMDEPBACKSLASH=''
AMDEP_FALSE=''
AMDEP_TRUE='#'
AMTAR='${SHELL} /<<PKGBUILDDIR>>/build-scripts/missing --run tar'
AUTOCONF='${SHELL} /<<PKGBUILDDIR>>/build-scripts/missing --run autoconf'
AUTOHEADER='${SHELL} /<<PKGBUILDDIR>>/build-scripts/missing --run autoheader'
AUTOMAKE='${SHELL} /<<PKGBUILDDIR>>/build-scripts/missing --run automake-1.11'
AWK='mawk'
CC='x86_64-linux-gnu-gcc'
CCDEPMODE='depmode=none'
CFLAGS='-g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection'
CPP=''
CPPFLAGS='-Wdate-time -D_FORTIFY_SOURCE=2'
CYGPATH_W='echo'
DEFS=''
DEPDIR='.deps'
ECHO_C=''
ECHO_N='-n'
ECHO_T=''
EGREP=''
EXEEXT=''
GREP=''
INSTALL_DATA='${INSTALL} -m 644'
INSTALL_PROGRAM='${INSTALL}'
INSTALL_SCRIPT='${INSTALL}'
INSTALL_STRIP_PROGRAM='$(install_sh) -c -s'
JACK_CFLAGS=''
JACK_LIBS=''
LDFLAGS='-Wl,-z,relro'
LIBOBJS=''
LIBS='-lm '
LN_S='ln -s'
LTLIBOBJS=''
MAKEINFO='${SHELL} /<<PKGBUILDDIR>>/build-scripts/missing --run makeinfo'
MKDIR_P='/usr/bin/mkdir -p'
OBJEXT='o'
PACKAGE='silentjack'
PACKAGE_BUGREPORT='[email protected]'
PACKAGE_NAME='silentjack'
PACKAGE_STRING='silentjack 0.3'
PACKAGE_TARNAME='silentjack'
PACKAGE_VERSION='0.3'
PATH_SEPARATOR=':'
PKG_CONFIG=''
SET_MAKE=''
SHELL='/bin/bash'
STRIP=''
VERSION='0.3'
ac_ct_CC='x86_64-linux-gnu-gcc'
am__EXEEXT_FALSE=''
am__EXEEXT_TRUE=''
am__fastdepCC_FALSE=''
am__fastdepCC_TRUE='#'
am__include='include'
am__isrc=''
am__leading_dot='.'
am__quote=''
am__tar='${AMTAR} chof - "$$tardir"'
am__untar='${AMTAR} xf -'
bindir='${exec_prefix}/bin'
build_alias='x86_64-linux-gnu'
datadir='${datarootdir}'
datarootdir='${prefix}/share'
docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
dvidir='${docdir}'
exec_prefix='NONE'
host_alias=''
htmldir='${docdir}'
includedir='${prefix}/include'
infodir='${prefix}/share/info'
install_sh='${SHELL} /<<PKGBUILDDIR>>/build-scripts/install-sh'
libdir='${prefix}/lib/x86_64-linux-gnu'
libexecdir='${prefix}/lib/x86_64-linux-gnu'
localedir='${datarootdir}/locale'
localstatedir='/var'
mandir='${prefix}/share/man'
mkdir_p='/usr/bin/mkdir -p'
oldincludedir='/usr/include'
pdfdir='${docdir}'
prefix='/usr'
program_transform_name='s,x,x,'
psdir='${docdir}'
sbindir='${exec_prefix}/sbin'
sharedstatedir='${prefix}/com'
sysconfdir='/etc'
target_alias=''

## ----------- ##
## confdefs.h. ##
## ----------- ##

#define PACKAGE_NAME "silentjack"
#define PACKAGE_TARNAME "silentjack"
#define PACKAGE_VERSION "0.3"
#define PACKAGE_STRING "silentjack 0.3"
#define PACKAGE_BUGREPORT "[email protected]"
#define PACKAGE "silentjack"
#define VERSION "0.3"
#define HAVE_LIBM 1

configure: exit 1
dh_auto_configure: error: ./configure --build=x86_64-linux-gnu --prefix=/usr --includedir=\${prefix}/include --mandir=\${prefix}/share/man --infodir=\${prefix}/share/info --sysconfdir=/etc --localstatedir=/var --disable-option-checking --disable-silent-rules --libdir=\${prefix}/lib/x86_64-linux-gnu --libexecdir=\${prefix}/lib/x86_64-linux-gnu --disable-maintainer-mode --disable-dependency-tracking returned exit code 1
make: *** [debian/rules:4: binary] Error 25
dpkg-buildpackage: error: debian/rules binary subprocess failed with exit status 2
--------------------------------------------------------------------------------